Article: 6122 of sci.geo.satellite-nav From: "Mike Miller" Newsgroups: sci.geo.satellite-nav Subject: Of Math and GPS and Sportscars Lines: 32 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Message-ID: NNTP-Posting-Host: pWrQ7-90158-ER5-270553@rwcrnsc52 X-Complaints-To: abuse@attbi.com X-Trace: rwcrnsc52 1007832912 pWrQ7-90158-ER5-270553@rwcrnsc52 (Sat, 08 Dec 2001 17:35:12 GMT) NNTP-Posting-Date: Sat, 08 Dec 2001 17:35:12 GMT Organization: AT&T Broadband Date: Sat, 08 Dec 2001 17:35:12 GMT Path: news.meer.net!sea-read.news.verio.net!dfw-artgen.news.verio.net!dfw-peer.news.verio.net!news.verio.net!newspump.sol.net!europa.netcrusader.net!usenetserver.com!204.127.161.3!wn3feed!worldnet.att.net!204.127.198.204!attbi_feed4!attbi.com!rwcrnsc52.POSTED!not-for-mail Xref: archive.mv.meer.net sci.geo.satellite-nav:6122 Got a few GPS related questions for y'all. Earlier in the week, I won a Garmin GPS III as a door prise at a Microsoft dog-n-pony show. Before that, I only had a passing interest in it, and now that I have one, I might as well futz with it. :) I've noticed that it agrees almost perfectly with the speedo in my car, which is cool. I remember form my Civil Engineering classes in college that the military grade signal was supposed to be accurate to within 25 or 50 feet _at_MACH_3_. I'm also aware that this military quality signal has (and is) available now for consumer products. Now I've got a friend with another automotive device called a GEEZ. It's a very sensitive 2D acclerometer, and software to capture (and fiddle with) the data it provides. It allows for skidpad analysis, quarter mile stuff, engine dyno stuff, and track performance. (http://www.extremegeez.com) When I last played with it on a track, you'd get about one and a half circuits of the track before drift and error made the data analysis useless. It was really good for short periods of time, and it also required a data acquisition device (either a laptop or Palm Pilot). Now, the Garmin GPS has data capturing capability, and an interface to a laptop. The GPS _signal_ has sufficient precision. Does any of you know if the data capturing would be good enough to do some performance calculations? (With a heavy dose of math.) It'd seem that the _repeatablity_ on something like a roadcourse would certainly be better than the GEEZ product, but the question would be _resolution_. Mike "N39 31.975 W104 47.114 5919 MSL" Miller