Subject: Re: help GPS:waypoint
From: A. J. deLange
Date: 14 Nov 1996 13:31:39 GMT
In article <56d4h2$s5q@alf01.uib.es> , aix004@teix.uib.es writes:
>Please, I need to find some information about waypoint. What is this?..
As its name suggests, it is a "point along the way". In navigating
A to B it is not always possible or desireable to follow a great
circle route. In a boat there may be a land mass to circumnavigate.
In the air there may be a restricted area or winds may be more
favorable off the direct rout or air traffic control may have
some restrictions based on traffic. In any of these cases the
route is broken up into segments and the end points of the
segments are waypoints.
Even in the case where great circle navigation is being
used the route is often broken up into segments short
enough that the heading is approximately constant. Again
the waypoints define the segments
C*
B* D*
A* E*
F*
In this crude ascii art sketch the navigator is sailing
a great circle route from A to F. He breaks the great
circle up into segments defined by the source and
destination points and the waypoints B,C,D, & E.
But the definition is even broader than this. A waypoint
is ANY point that you, the navigator, wish to use in
your planning for any purpose whatsoever (half way point,
alternate airport(s), locations of nav aids, buoys or
where you caught the big one last week). When driving in
European cities (hopeless without GPS!) I mark (i.e.
load into the GPS receiver as waypoints) major
highway intersections, the airport, the hotel etc. When
I'm lost these serve as references.
AJ
ajdel@mindspring.com
Subject: Re: Need advice on GPS receiver
From: A. J. deLange
Date: 14 Nov 1996 13:43:41 GMT
In article <55p6vi$219@redgreen.cs.ubc.ca> Dave Martindale,
davem@cs.ubc.ca writes:
>jdv@iglou.com writes:
>>I am looking into buying a GPS receiver for APRS (Automatic Packet Position
>>Reporting System) use. The requirements are: <300$US and must be able to be
>>interfaced to laptop. I am considering the Garmin 45/45xl, Magellan 3000 but
>>may consider other makes/models.
Depending on what you are planning to do you may not need the
laptop interface. At least one TNC (Kantronics PC3) is capable
of accepting designated NMEA sentences directly from the
reciever and transmitting them at designated intervals. Of
particular importance here is that this TNC responds to the
TTL levels from the Garmin radios (and not all computers do
this). You can, of course, configure a GPS receiver, a laptop
and a TNC in a mobile if you want the displays and logging
that APRS software supplies but if you only want to transpond
your location it isn't necessary.
Conversely, you don't need a GPS receiver to set up a stationary
APRS station although real time GPS input is accepted.
Anyway, the big issue is whether the GPS receiver's NMEA
output signal levels are compatible with the UART in the
computer. As I mentioned above the Garmins put out
TTL levels which must be translated to RS232 levels to
interface with some Macs (but not all require this). PC's
I don't know about (and hope to keep it this way). Level
converters are available commercially and are easy to
build for those who like to tinker.
AJ
ajdel@mindspring.com
Subject: Re: Delorme Tripmate GPS for SA 4.0
From: Daniel Butler
Date: Thu, 14 Nov 1996 08:36:32 -0500
Stan Slonkosky wrote:
> I notice that at least one error remains on SA 4.0 remains. I first
> noticed it with SA 2.0 and it still hasn't been corrected and that's the
> bridge across the Colorado River between the north end of Laughlin, NV,
> and Bullhead City, AZ. Part of the bridge has been broken off and placed
> downstream about half a mile where neither end of it connects to any other
> road. A couple of errors I noticed in SA 3.0 have been corrected.
> Orangethorpe Ave. in Orange County, CA, is finally one word (instead of
> Orange Thorpe) and a street I used to live on south of Globe, AZ, in Six
> Shooter Canyon, is now correctly shown as Winchester Dr (instead of
> Winchester Rd). I think the above errors originated in the Tiger database,
> because I've seen the same errors on CD's from Precision Mapping, one
> other publisher whose name I can't recall and the Tiger WWW pages (though
> I haven't looked there in several months to see if things have been
> corrected).
Has the level of detail increased any, as the web page seems to
indicate, or is it mainly minor corrections such as these?
Daniel Butler
dbutler@yup.com
Subject: Re: New to GPS - Garmin, Eagle or magellan
From: stimpy@tstonramp.com
Date: Thu, 14 Nov 1996 11:15:57 -0600
X-Article-Creation-Date: Wed Nov 13 16:42:27 1996 GMT
X-Originating-IP-Addr: 206.55.129.66 (tst56.tstonramp.com)
X-Authenticated-Sender: stimpy@tstonramp.com
Lines: 18
In article <55e0rd$ho8@news-central.tiac.net>,
phils@tiac.net (Phil Smith) wrote:
>
> Since you are going to be using it in the woods, I'd definitely get a
> unit with an external antenna. Trees reduce the effectiveness of an
> internal antenna model a la Garmin 38 to near uselessness. In your
> boat it would work fine however. When I bought my Garmin 38, 4 months
> and $50 more in cost ago, it seemed that the Garmin unit offered more
> for the dollar than the Magellan units.
>
The Garmin may cost less but it doesn't track satellites as well as the
Magellan. With Magellan handhelds, you don't need to go to an external antenna
because their internal antennas are already very sensitive. The Garmins may
have a couple of extra bells and whistles but it lacks horribly in its primary
job: tracking and holding on to satellites in adverse conditions.
-----------------------------------------------------------------------
This article was posted to Usenet via the Posting Service at Deja News:
http://www.dejanews.com/ [Search, Post, and Read Usenet News]
Subject: Re: Avis Nav Systems
From: will@math.uga.edu (Will Kazez)
Date: Thu, 14 Nov 1996 13:41:49 -0400
> I rented an Olds 88 from Avis in Miami a couple of weeks ago and it had one of
> their nav systems in it. I am very familiar with GPS but have only used it on
> the water. Having GPS tied in to a street overlay including the database with
> hotels, banks, police stations, grocery stores, etc. was great.
>
> Does anyone have any information on what company offers this database and if
> it is available to the general public?
>
> Any information would be appreciated.
>
> Ed
At www.pathmaster.com you can find out about just such a GPS system. It
is a very cool looking system, but then for $2,995 installed, it ought to
be.
Will
Subject: Q: GPS jamming in Florida?
From: buchmann@ll.mit.edu (Karl Buchmann)
Date: 14 Nov 1996 20:30:01 GMT
Hi all,
We have a Allen Osborne Turbo Rogue TR8100 operating down on the
panhandle in Florida. Lately it has been experiencing a problem
where it will be locked on to 4-8 satellites, in normal track,
and then suddenly it will lose track on most or all of the
birds. It will then refuse to lock back on to the satellites.
The clock and position information gets completely goofed up,
but resetting the clock manually seems to enable the receiver
to lock back on, if only briefly.
We are surmising that it could be a problem with the antenna or
cable, the receiver, or, perhaps some sort of interference.
My question to anyone on the group is: do you know of any jamming
experiments being conducted in the gulf, or around the Eglin
Air Force Base on the Florida panhandle? I noticed an earlier
thread on jamming in California, and assumed the same could
happen in Fla.
If anyone can shed some light on this problem, it would be a big
help.
Thanks,
-Karl
Karl P. Buchmann / MIT Lincoln Laboratory / buchmann@ll.mit.edu
Subject: Re: Who sells garmin 45 in Orlando, FL?
From: "J.E. Schneider"
Date: Thu, 14 Nov 1996 17:46:51 GMT
Joop van der Velden wrote:
>
> Short vacation in FL. Would like to buy a garmin 45, prices here in
> Netherlands are like $500.
>
> TIA,
>
> Joopv@solair1.inter.nl.net
Joop,
There is/was a BOAT/US in Altamonte Springs, FL. The phone number is
407-339-8005. If I remember correctly, Altamonte Springs is about
30 minutes north of Orlando where I4 and SR436 meet. Try giving them a
call. If someone in the area can be more precise with location, it might
help.
Good Luck,
Jim
Subject: Re: Avis Nav Systems
From: Edward Hale
Date: Fri, 15 Nov 1996 00:05:31 GMT
In article ,
will@math.uga.edu (Will Kazez) wrote:
>> I rented an Olds 88 from Avis in Miami a couple of weeks ago and it had
one of
>> their nav systems in it. I am very familiar with GPS but have only used
it on
>> the water. Having GPS tied in to a street overlay including the database
with
>> hotels, banks, police stations, grocery stores, etc. was great.
>>
>> Does anyone have any information on what company offers this database and
if
>> it is available to the general public?
>>
>> Any information would be appreciated.
>>
>> Ed
>
>At www.pathmaster.com you can find out about just such a GPS system. It
>is a very cool looking system, but then for $2,995 installed, it ought to
>be.
>
> Will
I figured it would be expensive but it sure worked great.
Ed
Subject: Garmin 175 Report
From: "oparker@srt.com"
Date: Thu, 14 Nov 1996 14:20:43 -0600
I just recieved my GPSMAP 175 Monday night(11-11-96). I haven't gone
anywhere to try it out yet other than driving to work. After I turned it
on
and started to read how to use it at home, the thing reached out and
grabbed 4 satellites and locked on... inside my house. Granted the
signal strength wasn't very strong but it locked on and found its
location. After owning a Garmin GPS 45 for 1.5 years I was impressed. My
little '45 had trouble in moderately dense Alabama / Tennessee woods.
Tuesday I drove to work with the '45 & the '175 on the dash and they
both agreed on their location within a few tenths of a degree. The '45
would lose lock now and then when I would get stuck next to a big truck
or go down a road with high banks or trees on both sides of me. The
'175 had no problems. I even took it out of the dash and put it in the
seat next to me and still maintained lock even with weaker signals and 1
less satellite.
I have ordered a pc interface cable for uploading/downloading routes,
waypoints and plotting info. Even though I use Garmin's software for
backing up waypoint and route data, the software I like best is from
Fugawi (http://www.fugawi.com). No, I have no ties to them. The Garmin
folks told me they are about to release new software that's Windows
based this time. It's about time!
I have no idea when I'll get a chance to take the '175 in the woods for
a real test. With Thanksgiving, Christmas and work keeping busy I have
no plans in the immediate future. So right now I'm limited to "city
tests".
The built in world map has little information outside of outlines of
the continents and key city names. The G-chart cartridges contain a lot
more information including interstates and secondary roads and rest
stops around major water ways. However, all the charts are geared toward
boating. Even the inland charts. Somebody besides just me needs to call
Garmin and and have them create some charts of national parks and
camping areas within each state. They CAN do it. They make their own
charts. Even lake areas in national parks are currently left out. By the
way, this lack of hiking/camping chart info applies to Lowrance/Eagle
charts too!
Bottom line: Right now I'm happy.
One day all the neat features will be in one cheap unit and SA will be
a thing of the past. But for now, this is a good compromise for me.
Subject: Re: My WEB page!
From: Oliver Fleming
Date: Fri, 15 Nov 1996 12:01:16 +1100
BRANDY LYNN wrote:
>
> My name is Brandy Lynn Altschul. I am a
> sophmore majoring in pediatric nursing
> at the University of Michigan in Ann
> Arbor.
>
> I'm originally from South Carolina,
> where I was the valedictorian of my
> private high school.
>
> I've been reading all these postings
> and/or spammings about the naked mile
> and thought I'd put my two cents worth
> in.
>
> Of the hundreds of women who ran the
> naked mile last year, very few
> were freshwomen as myself. Most of the
> other women I ran with were seniors who
> had never run the naked mile before.
>
> But when I came to U of M and heard
> about it, I thought it was such a cool
> idea :) I decided to run it all four
> years!!
>
> Yes, you heard me, I ran the naked mile
> and I am proud of it!!!!!
>
> Plus, I know I'm featured in at least
> one video- well maybe featured is not
> accurate, but my picture -- and it is
> very revealing :)
> is in that naked mile video they are
> selling out on the 'net.
>
> What would my mom say????
>
> She'd be just as proud of me as I
> am!!!!
>
> She taught me to never be ashamed of
> my body, and
> I'M NOT!!!!!!!!!!!!!!!
>
> So to all you jerks out there who are
> upset about the naked mile and the
> people that have spammed usenet about
> it-- I say
>
> KISS MY NAKED
> ASS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!
>
> I'M GOING TO POST THIS TO AS MANY
> NEWSGROUPS AS POSSIBLE JUST TO
> AGGRAVIATE YOU MISERABLE LITTLE GEEKS
> WHO THINK YOU OWN THE INTERNET.
>
> You just go ahead and tattle on me to
> my ISP you gnarly LOSERS who couldn't
> get a date if your life depended on
> it!!!!!
>
> By the way. I am the tall girl with the
> knit hat in the video. If you like what
> you see- I do part-time modeling.
>
> E-mail me at branalts@umich.edu
>
> SERIOUS OFFERS ONLY, PLEASE.
>
> oh yeah, one more thing... type NAKED
> MILE in yahoo---
>
> AND FOLLOW THE LINKS
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
> HEY, IGNORE EVERYTHING AFTER THIS
> LINE!!
> ___________________________________
>
> alt.hi.
> alt.hindu
> alt.history.
> alt.holowOrld.rpg
> alt.home.
> alt.home-theater.
> alt.homosexual.
> alt.horology
> alt.horror.
> alt.hotrod
> alt.housing.nontrad
> alt.how-to
> alt.html
> alt.human-brain
> alt.humor.
> alt.hvac
> alt.hypertext
> alt.hypnosis
> alt.i.
>
> alt.i-like-toejam.lets-share-a-slice.bu
> t-hold-the-cow-eyes-please
>
> alt.icelandic.waif.bjork.bjork.bjork
> alt.illuminati
> alt.illustration.technical
> alt.ima.
> alt.imag.
> alt.image.medical
> alt.immortal
> alt.impeach.clinton
> alt.india.progressive
> alt.individualism
> alt.industrial.
> alt.infertility
> alt.info-science
> alt.inner.circle
> alt.internet.
> alt.inventors
> alt.invest.penny-stocks
> alt.irc.
> alt.irs.class-action
> alt.is.
> alt.islam.sufism
> alt.japanese.text
> alt.jokes.
> alt.journalism.
>
> alt.justin.what.are.you.doing.tonight
> alt.jyotish
> alt.kalbo
> alt.karen
> alt.kegs
> alt.ketchup
> alt.kids-talk.
> alt.kill.the.whales
> alt.lacrosse
>
> alt.lamers.james-koput.net-abuser
> alt.landscape.architecture
> alt.lang.
> alt.language.urdu.poetry
> alt.lasers
> alt.law-enforcement
> alt.lawyers.sue.sue.sue
> alt.learning-to-lead
> alt.lefthanders
> alt.legend.king-arthur
> alt.lemmings
> alt.lesbian.feminist.poetry
> alt.letzebuerger
> alt.life.
> alt.lifestyle.barefoot
> alt.literacy.adult
> alt.locksmithing
> alt.lotto.players
> alt.love
> alt.lucky.w
> alt.lunatics
> alt.lycra
> alt.mac.
> alt.machines.cnc
> alt.mag.
> alt.magazines.pornographic
> alt.magic.
> alt.magick.
> alt.make.money.fast
> alt.malta
> alt.management.tech-support
> alt.manga
> alt.manufacturing.misc
>
> alt.marketplace.funky-stuff.forsale
> alt.masonic.
> alt.math.iams
> alt.mcdonalds
> alt.mechwarrior2
> alt.med.
> alt.medical.sales.jobs.offered
> alt.meditation.
> alt.mega-ego.yonderboy
> alt.memetics
> alt.mens-rights
> alt.messianic
> alt.mexico
> alt.military.
> alt.mindcontrol
> alt.mining.recreational
> alt.misanthropy
> alt.misc.
> alt.missing-adults
> alt.missing-kids
> alt.mobilehome
> alt.models
> alt.motd
> alt.motherjones
> alt.motorcycle.
> alt.motorcycles.harley
> alt.motss.bisexua-l
> alt.mountain-bike
> alt.movies.
> alt.msdos.
> alt.mud.
> alt.multimedia.
> alt.music.
> alt.my.
> alt.mythology.
> alt.nader.elziq.is.a.loser
> alt.native
> alt.nature.mushrooms
> alt.naughty.pictures
> alt.necronomicon
> alt.neo-tech
> alt.netcom.sucks
> alt.netgames.bolo
> alt.new-england
> alt.newbie
> alt.newbies
> alt.newgroup.for.fun.fun.fun
> alt.news.
> alt.news-media
> alt.niteclub.
> alt.nocem.misc
> alt.noise
> alt.non.sequitur
> alt.nosebeeping
> alt.npractitioners
> alt.ntn-trivia
> alt.nuke.
> alt.null
> alt.obituaries
> alt.occult.kabbalah.golden-dawn
> alt.ofc
> alt.office.management
> alt.online-service.
> alt.org.
> alt.os.
> alt.out-of-body
> alt.pagan.
> alt.pantyhose
> alt.parallel.universes
> alt.paranet.
> alt.paranormal.
> alt.parenting.
> alt.parents-teens
> alt.party
> alt.pave.the.earth
> alt.peace.
> alt.peace-corps
> alt.peeves
> alt.penguin-fetish.recovery
> alt.periphs.pcmcia
> alt.personals.
> alt.pets.
> alt.ph.
> alt.philosophy.
> alt.phreaking
> alt.pinecone
> alt.pissed.federal.employees
> alt.pizza.delivery.drivers
> alt.planning.
> alt.politics.
> alt.polyamory
> alt.postmodern
> alt.power
> alt.president.clinton
> alt.prisons
> alt.privacy.
> alt.private.investigator
> alt.prophecies.nostradamus [FAQ]
> alt.prose.
> alt.psst.hoy
> alt.psychoactives
> alt.psychology.
> alt.psychotic.roommates
> alt.pub.
> alt.publish.newspaper
> alt.pud
> alt.pulp
> alt.punk.
> alt.ql.creative
> alt.quotations
> alt.radio.
>
> alt.raffaella.carra.sucks.sucks.sucks
> alt.railroad
> alt.random.noise
> alt.rap.
> alt.rap-gdead
> alt.rave
> alt.real-estate-agents
> alt.realtor.relocation
> alt.rec.
> alt.recovery.
> alt.religion.
> alt.relocate
> alt.rep.cypress-hill
> alt.restaurants
> alt.retribution
> alt.revenge
> alt.revisionism
> alt.revolution.
> alt.rhode_island
> alt.rmfroup
> alt.rmgroup
> alt.rock-n-roll.
> alt.rodney-king
> alt.romance.
> alt.rpg.
> alt.rush-limbaugh
> alt.rv
> alt.sailing.asa
> alt.satanism
> alt.satellite.
> alt.save.the.earth
> alt.sb.programmer
> alt.school.homework-help
> alt.sci.
> alt.scooter
> alt.scottish.clans
> alt.security.
> alt.seduction.fast
> alt.sega.genesis
> alt.self-esteem
> alt.self-improve
> alt.sewing
> alt.sex.
> alt.sexual.abuse.recovery
> alt.sexy.bald.captains
> alt.sf4m
> alt.shared-reality.
> alt.shenanigans
> alt.shesaid
> alt.shoe.lesbians
> alt.showbiz.gossip
> alt.shut.the.hell.up.geek
> alt.sigma2.penis
> alt.silly.group.names.d
> alt.siplist
> alt.skate.
> alt.skate-board
> alt.skincare.
> alt.skinheads.
> alt.skunks
> alt.sl9
> alt.slack
> alt.smokers.
> alt.smouldering.dog.zone
> alt.snail-mail
> alt.snowmobiles
> alt.society.
> alt.soft-sys.corel.draw
> alt.solar.
> alt.solaris.x86
> alt.soulmates
> alt.sources.
> alt.spam
> alt.speech.debate
> alt.spleen
> alt.sport.
> alt.sports.
> alt.stagecraft
> alt.starfleet.
> alt.startrek.
> alt.steinberg.cubase
> alt.stephen.currier
> alt.stop.spamming
> alt.stories.erotic
> alt.students.exchange
> alt.stupidity.
> alt.sufi
> alt.suicide.holiday
> alt.super.
> alt.supermodels.
> alt.support.
> alt.surfing.
> alt.surrealism
> alt.sustainable.agriculture
>
> alt.svens.house.of.12.year-old.lust
> alt.swedish.chef.bork.bork.bork
> alt.sys.
> alt.sysadmin.
> alt.taiwan.republic
> alt.talk.
> alt.talkers
> alt.tanya.shalayeva
> alt.tarot
> alt.tasteless.
> alt.teachers.lesson-planning
> alt.technology.misc
> alt.teens.
> alt.telescopes.meade.lx200
> alt.tennis
> alt.test.
> alt.testing.testing
> alt.theft.sign-stealing
> alt.thinking.hurts
> alt.this.is.yet.another.test
> alt.thought.southern
>
> alt.timewasers
> alt.tinygirls
> alt.toolkits.xview
> alt.toon-pics
> alt.toys.
> alt.transgendered
> alt.travel.
> alt.treasure.hunting
> alt.troll
> alt.true-crime
> alt.tv
> alt.ufc
> alt.ufo.
> alt.unix.wizards
>
> alt.usage.
> alt.usenet.
> alt.utensils.spork
> alt.uu.
> alt.vacation.losvegas
> alt.vampyres
> alt.video.
> alt.visa.us
> alt.wanking.big.sigs
> alt.war.
> alt.warez.
> alt.wedding
> alt.wesley.crusher.die.die.die
> alt.windows.
> alt.windows95
> alt.winsock.
> alt.wired
> alt.wolves.
> alt.women.
> alt.wonderment.bgjw
> alt.worst.of.usenet
> alt.www.hotjava
> alt.yoga
> alt.zen
> alt.zen+budo
> alt.zima
> alt.zines
> alt.zorch
> END HERE
> _______________________________________
> biz.books.technical
> biz.clarinet.
> biz.comp.
> biz.config
> biz.control
> biz.digex.announce
> biz.digital.
> biz.general
> biz.jobs.offered
> biz.marketplace.
> biz.next.newprod
> biz.oreilly.announce
> biz.pagesat.
> biz.stolen
> biz.tadpole.sparcbook
> biz.test
> biz.univel.misc
> biz.zeos.
>
> comp.admin.policy
> comp.ai.
> comp.answers
>
> comp.apps.spreadsheets
> comp.arch.
> comp.archives.
> comp.bbs.
> comp.benchmarks
> comp.binaries.
> comp.bugs.
> comp.cad.
> comp.client-server
> comp.cog-eng
> comp.compilers.
> comp.compression.
> comp.constraints
> comp.databases.
> comp.dcom.
> comp.doc.
> comp.dsp
> comp.editors
> comp.edu.
> comp.emacs.
> comp.emulators.
> comp.fonts [FAQ]
> comp.forgery.pgp.test
> comp.graphics.
> comp.groupware.
> comp.home.
> comp.human-factors
> comp.infosystems.
> comp.internet.
> comp.ivideodisc
> comp.lang.
> comp.laser-printers
> comp.lsi.
> comp.mail.
> comp.misc
> comp.multimedia
> comp.music.
> comp.networks.
> comp.newprod
> comp.object.
> comp.org.
> comp.os.
> comp.parallel.
> comp.patents
> comp.periphs.
> comp.programming.
> comp.protocols.
> comp.publish.
> comp.realtime
> comp.research.japan
> comp.risks
> comp.robotics.
> comp.security.
> comp.simulation
> comp.society.
> comp.soft-sys.
> comp.software.
> comp.software-eng
> comp.sources.
> comp.specification.
> comp.speech
> comp.std.
> comp.sw.components
> comp.sys.
> comp.terminals.
> comp.text.
> comp.theory.
> comp.unix.
> comp.virus
> comp.windows.
> gnu.announce
> gnu.bash.bug
> gnu.chess
> gnu.emacs.
> gnu.epoch.misc
> gnu.g++.
> gnu.gcc.
> gnu.gdb.bug
> gnu.ghostscript.bug
> gnu.gnusenet.
> gnu.groff.bug
> gnu.misc.discuss
> gnu.smalltalk.bug
> gnu.utils.bug
>
>
>
> news.answers
> news.groups.
> news.lists.
> news.misc
> news.newusers.questions
> news.software.
>
> rec.animals.wildlife
>
> rec.answers
> rec.antiques.
> rec.aquaria.
> rec.arts.
> rec.audio.
> rec.autos.
> rec.aviation.
> rec.backcountry
> rec.bicycles.
> rec.birds
> rec.boats.
> rec.climbing
> rec.collecting.
> rec.crafts.
> rec.drugs.
> rec.equestrian
> rec.fag-bashing
> rec.folk-dancing
> rec.food.
> rec.gambling.
> rec.games.
> rec.gardens.
> rec.guns
> rec.heraldry
> rec.humor.
> rec.hunting.
> rec.juggling
> rec.kites
> rec.knives
> rec.mag.
> rec.martial-arts
> rec.misc
> rec.models.
> rec.motorcycles.
> rec.music.
> rec.nude
> rec.org.
> rec.outdoors.
> rec.parks.theme
> rec.pets.
> rec.photo.
> rec.ponds
>
> rec.puzzles.
> rec.pyrotechnics
> rec.radio.
> rec.roller-coaster
> rec.running
> rec.scouting.
> rec.scuba.
> rec.skiing.
> rec.skydiving
> rec.sport.
> rec.toys.
> rec.travel.
> rec.video.
> rec.windsurfing
> rec.woodworking
> sci.aeronautics.
> sci.agriculture.
> sci.answers
> sci.anthropology.
> sci.aquaria
> sci.archaeology.
> sci.astro.
> sci.astrology.
> sci.bio.
> sci.chem.
> sci.classics
> sci.cognitive
> sci.comp-aided
> sci.cryonics
> sci.crypt.
> sci.data.formats
> sci.econ.
> sci.edu
> sci.electronics.
> sci.energy.
> sci.engr.
> sci.environment
> sci.fractals
> sci.geo.
> sci.image.processing
> sci.lang.
> sci.life-extension
> sci.logic
> sci.materials.
> sci.math.
> sci.mech.
> sci.med.
> sci.military.
> sci.misc
> sci.nanotech
> sci.nonlinear
> sci.op-research
> sci.optics.
> sci.philosophy.
> sci.physics.
> sci.polymers
> sci.psychology.
> sci.research.
> sci.skeptic
> sci.space.
> sci.stat.
> sci.systems
> sci.techniques.
> sci.virtual-worlds
> soc.adoption.parenting
> soc.answers
> soc.atheism
> soc.bi
> soc.college.
> soc.couples.
> soc.culture.
> soc.feminism
> soc.genealogy.
> soc.history.
> soc.libraries.talk
> soc.men
> soc.misc
> soc.motss
> soc.net-people
> soc.org.
> soc.penpals
> soc.politics.
> soc.religion.
> soc.retirement
> soc.rights.human
> soc.singles
> soc.support.
> soc.veterans
> soc.women.
> talk.abortion
> talk.answers
> talk.atheism
> talk.bizarre
> talk.environment
> talk.euthanasia
>
> talk.origins
> talk.philosophy.
> talk.politics.
> talk.rape
> talk.religion.
> talk.rumors
Silly Tart this is all about satellite navigation group, we couldn't
care less about your naked ass. In fact your ass probably looks better
than you.
Go away and annoy someone who cares.
Oliver
--
---------------------------------------------------------------------------
: Email: oliver@mars.nettrek.net.au | Zendor Dragon
:
: "We'll go out through the Kitchen" - Tanis | -= UDIC
=- :
---------------------------------------------------------------------------
Subject: [Announcement] GPSy 1.5 -- Macintosh GPS with StreetAtlas support!
From: karen.nakamura@Yale.edu ( )
Date: 15 Nov 1996 02:57:53 GMT
Hi all -
Due to great user feedback, I've made numerous changes and updates and
am happy to announce version 1.5 of my program GPSy for Mac. It
connects to any NMEA-0183 compatible GPS/Loran-C/Decca or other
navigational unit and can display the data on its screen.
New to version 1.5 is DeLorme StreetAtlas 3.0 support. To my knowledge
of all Mac GPS programs, only GPSy has this feature. It plots and
displays your current location, heading, bearing, speed, distance to
go, and waypoint in StreetAtlas. You can use this for an automobile
auto-mapping system (I can hardly wait for the new PB1400s!). Look at
the screen shot on my web page.
Rather than wasting bandwidth, please check my WWW site where you can
download a demo version, read product information, and purchase it over
the web:
http://pantheon.yale.edu/~nakamura/gps/gpsy.html
Please feel free to send any bug reports or suggestions to me. Thanks!
- Karen Nakamura
karen.nakamura@yale.edu
Subject: Lowrance GPS
From: rfdesq@datadepot.com (Robert F. Danelen)
Date: Fri, 15 Nov 1996 04:23:17 GMT
Anyone have any thoughts on the new Lowrance Global Nav 200 $250.00
retail. It is an upgraded version of the new Eagle Explorer $199.00
retail. It appears to have: 12 Channel parallel, DGPS ready, external
antenna connector (powered), cigarette lighter adapter, lighted
display and keys (maybe), programmable windows, speaker, lat/lon, UTM.
Comments?
Thanks,
Robert
-----
Robert F. Danelen, Esq.
Sherman Oaks, CA
mailto:rfdesq@datadepot.com
http://www.datadepot.com/~rfdesq
Subject: Re: Speed measurement with gps
From: Jay Purvis
Date: Mon, 11 Nov 1996 11:02:55 -0500
Charlie Sorsby wrote:
> Just curious: While I don't question for a moment that some of the
> relative speed variation is due to the gps, I find it hard to
> believe that none is due to actual speed variation of the vehicle,
> that cruise control can maintain speed to significantly less than
> 1.23% error which is what a 0.8mph variation out of 65mph works out
> to be. Maybe under ideal conditions--perfectly level terrain, etc.
> but even that is hard for me to believe.
Of course, "some" error has to be from errors in cruise control. But
there are a number of errors we are dealing with. There is the
transient error and the steady state error. My assumption is we are
dealing with the stready state error. Within the steady state error,
there is the bias error and the error variance. A further assumption is
we are concened with the variance, not the bias. Thus, it is the steady
state variance error that is being compared to SA.
Based on my "subjective" experience with cruise control, the steady
state variance error is virtually undetectable when travelling along
terrain which provides a smooth steady state condition for the cruise
control feedback system. Note, cruise control doesn't need "ideal
conditions". It only needs terrain which provides a steady state
feeback condition. Again, based on my "subjective" experience, I would
guess the variance is less than 0.1 mph for a large majority of
interstate highways miles in the U.S. (Are there any cruise control
feedback designers out there who can provide some hard objective data to
support (or not support) my subjective experiences?).
So yes, it would be more correct to say the 0.8 mph difference is caused
by SA, receiver processing, and cruise control variance errors (I'm sure
there are many other errors as well). But, the dominant factors are SA
and receiver processing.
Jay Purvis
Director, Satellite Navigation Applications
Decision Technologies Division
GRC International, Inc.
Subject: Re: GPS w/o SA
From: Peter Halls
Date: Thu, 14 Nov 1996 19:52:13 +0000
Actually, whilst differential mode *does* correct SA, it also helps
correct other errors from atnospheric conditions, etc., and will usually
enable a better accuracy that would be obtained if they (DoD) merely
switched SA off ...
Peter
On Mon, 11 Nov 1996, Scott Pogorelc wrote:
> In article , genef@netcom.com (Gene Fornario) wrote:
>
> > In article
>
> Mark Crispin writes:
> >
> > >Differential does not cancel SA. Only PPS classified cryptokeys and
> > >algorithms cancel SA.
> >
> > From what I read in "GPS Made Easy"...two signals are sent from each
> > satellite, PPS and SPS with SA. So if I understand this correctly, a
> > PPS capable receiver can decrypt and use PPS. Does this mean the unit
> > ignores the SPS + SA signal?
>
> Differential may not "cancel" SA per se, but it does correct for it. SA
> manifests itself purely as range error so any differential system (local
> if you are working with single frequency receivers) will do a very good
> job of mitigating the effects of SA.
>
>
--------------------------------------------------------------------------
PPPPPH H | Peter Halls - University of York Computing Service -
P P H | GIS Advisor
P P H | Email: P.Halls@YORK.AC.UK
PPPPPJHHHHHH | Telephone: 01904 433806 FAX: 01904 433740
P J H | Smail: Computing Service,
P J H | University of York,
P J H | Heslington.
J | YORK Y01 5DD
J J | England.
JJJ This message has the status of a private & personal communication
--------------------------------------------------------------------------
Subject: Re: garmin 38 startup-problem?
From: bhall@mail.bcpl.lib.md.us
Date: 15 Nov 1996 08:01:18 GMT
On 13 Nov 1996 17:48:30 GMT, boddeke@ph.tn.tudelft.nl (Frank Boddeke) wrote:
> I just got a Garmin 38. When I press the "lamp" button
> it starts the selftest. followed by the sat-page.
> Pree enter gives the page with "country" en I slect
> USA-CA, then it starts. But after a while the screen blanks
> and when I try to start it up again, it shows the selftest
> for a few seconds and then shutsdown again.
>
> Is there a problem with my Garmin or am I doing something wrong?
> (I bought new batteries!)
>
> Thanks, Frank
Frank,make sure that you are not in normal or battery saver mode,
go to "auto locate" mode. When in normal or BS mode, the unit will kick off
out if it cannot find itself after a few minutes.
Brian Hall ---Old Bay Marina, Baltimore
--
Posted using Reference.COM http://www.reference.com
Browse, Search and Post Usenet and Mailing list Archive and Catalog.
InReference, Inc. accepts no responsibility for the content of this posting.
Subject: Re: Navstar.
From: pb@navdra.com (Peter Briggs)
Date: Thu, 14 Nov 96 16:43:26 GMT
In article <56d1rk$l2l@ustsu10.ust.hk>
ee_lwkaa@uxmail.ust.hk "Lee Wai Ki" writes:
> Do anyone knows the email address of Navstar company?
> The company sells XR-PC GPS receiver.
> I think the location is UK.
> ( Or do anyone have the fax no, tel no or BBS no. ?)
I don't know their general email address, however their telephone number is
+44 1604 585588, their fax is +44 1604 585599. I believe their BBS number
is +44 1604 759192.
Cheers ... Peter.
* The views expressed above are personal and are not endorsed by the DRA *
/*======================================================================*\
|* Navigation Systems Research, Q131 Building, | MIME, UU, XX or BinHex *|
|* DRA, Farnborough, Hants, England. GU14 6TD. | Encoding Acceptable *|
\*======================================================================*/
Subject: Re: sextants etc.
From: "James H. Maynard"
Date: Fri, 15 Nov 1996 03:12:56 -0800
Curtis Cameron wrote:
>
>In earlier posts, people here had educated me on the way latitude is
>measured on an ellipsoid model of the earth. What I learned is that
>the normal to the surface indicates latitude. This makes sense,
>because the captain on a ship at sea would have this as a
>reference. The normal can be found by bisecting the horizon-to-
>horizon angle in all directions.
>
>But what if I'm Meriwether Lewis, with Rocky Mountains all around me?
>If I can't see the horizon, how do I find the normal? The phrase
>"bubble sextant" that I've seen here makes me think that maybe you
>could use a bubble, or a plumb bob, to find the gravity direction.
>
>But it doesn't seem obvious to me that a plumb bob would point
>the same direction as the normal. On a sphere, of course it would,
>but on an ellipsoid, does it? It seems to me that it might point at
>the center of the ellipsoid, or somewhere between that direction and
>the normal.
>
>And what about variations in gravity caused by nearby masses like
>mountains? How much error would this cause?
>
>thanks,
>
>-curtis cameron
>posting from WGS-84 32.975 north, 96.709 west
Pete Engels and Robert Lawrence have both answered your question
well. I'll be a little more pedantic with the fine details.
Both the bubble sextant and the mariner's sextant measure angles
with respect to the local direction of the force of gravity.
With the mariner's sextant the sea horizon is used, as accelerations
you experience on a bouncing boat prevent you from measuring
the direction of gravity with respect to the earth. (You can
measure the _apparent_ direction of gravity in your accelerating
frame of reference - the bouncing boat - but that doesn't do you
much good.) So the sea itself is used as an enormous "bubble".
A bubble sextant assumes that you are _not_ accelerating with
respect to the earth. This is a tolerable approximation if
you and your bubble sextant are aboard an aircraft that is in
straight and level flight, but it would introduce intolerable
errors if used in a small boat bobbing about on the surface of
the sea.
Surveyors use instruments such as theodolites, which again
are levelled with bubble levels. They, too, can find geographic
location by sighting on celestial bodies, using the same
principles as celestial navigators have used for years. Usually
there are survey monuments nearby to work from and get better
accuracy, but celestial techniques were used in the old days
before the extensive network of survey markers was established.
In all cases, you measure the angles with respect to the local
"plumb line" - the direction of the gravitional force at your
location. Unfortunately, the direction of gravity isn't exactly
the same as the direction normal to the ellipsoid that is used
as a reference for determining the geodetic latitude and longitude
of a place. It seems that the variations in terrain - mountains,
valleys, seas, etc - and the different densities of the rocks in
the mountains compared to those in the sea bed - cause plumb bobs
to be deflected somewhat from the direction of a normal to the
idealized ellipsoid(s) that we use as reference surfaces for
latitude and longitude. (This was discovered during the great
survey of India under the direction of Sir George Everest, after
whom the mountain is named. The effect is called the "deflection
of the vertical" and it amounts to only a few seconds of arc.)
There is a whole family of gravitational equipotential surfaces,
each of which is a set of points at which a mass will have the
same "gravitational potential energy." At each point of each
such surface, the plumb line (the direction of gravity) is
everywhere perpendicular to the surface. The gravitational
equipotential surface which best approximates sea level is called
the "geoid," and elevations of locations above "mean sea level,"
are the heights of those locations above the geoid.
Regardless of whether we measure the angles of celestial bodies
aboe the horizon with a mariner's sextant, or an aviator's bubble
sextant, or a mariner's sextant with an artificial horizon, or
a surveyors theodolite, we are in effect measuring the angle
between the plumb line (the direction of gravity) and those
celestial bodies. In other words, to simplify a little (but not
too much, I'm being pedantic here :-), we're measuring the angle
of celestial bodies above the surface of the geoid. Because of
the effect of terrain variations - deflection of the vertical
and all that - the geoid is _not_ a simple mathematical ellipsoid
of revolution. It does however, approximate such an ellipsoid
much more closely than does the actual terrain. The geoid
undulates up and down, but rather gradually and smoothly compared
to the terrain. Because the geoid is such an irregular shape,
we use various ellipsoids, with various dimensions, to approximate
the shape of the earth for purposes of map projections. That is,
for figuring out where to draw the lines of latitude and longitude
on maps. These various ellipsoids, used for various "horizontal
datums" on maps and charts, have different dimensions. There is
the Clarke 1866 ellipsoid, used with the NAD 1927 datum used on
most topographic maps, and older nautical charts, published in
the U.S. And there is the NAD 1983 datum, which is for our purposes
identical to the ellipsoid of the WGS 1984 datum that is used in
GPS receivers. (The difference between the ellipsoid used in the
NAD 1983 datum and that used in the WGS 1984 datum is only a matter
of one tenth of a millimetre in the semiminor axis.)
The ellipsoids used for different map datums are theoretical
mathematical surfaces used for convenience in making maps. They
approximate the geoid, but are not identical with it. So for
the finest degree of precision in converting the angles we measure
with instruments such as sextants and theodolites, we ought to
allow for the "deflection of the vertical" to account for the
fact that the ellipsoid to which we reference latitude and longitude
is not the same as the geoid to which "mean sea level" heights
are referenced.
It's kind of long-winded, and pedantic (I warned you!), but I
hope you find this explanation helpful.
