Thread: Motorsport Performance Application - looking for developer to bring idea to reality
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jgombos is offline jgombos
2008-02-26 , 20:14
Posts: 67 | Thanked: 13 times | Joined on Feb 2008 @ U.S.A.
#29
Originally Posted by tz1 View Post
But let me break some misconceptions and myths.

The location is ACCURATE to only a 2.5-3 meters, but is PRECISE to a much smaller space especially over a very short time when the satellites used aren't changing and all have the same error. Otherwise every fix would swing in and out within the 3 meters. It doesn't. It often moves by a micro degree or two at most.
That's very useful to know. The other day I was criticizing most of the nav systems on the market for not having a gyro. (Aside from pricey dash mounts, only tomtom and cobra seems to have intertial nav as a backup). Someone told me the gyro is useless, because of the mutual gross inaccuracy of both GPS and maps. My claim was that with a gyro, a nav system would know to reroute quicker in the event of a deviation. Currently, most nav systems are unaware when someone deviates until the deviation is very significant, and then often the rerouting isn't complete until you're already at the next intersection. But according to what you're saying w/ precision being acceptable, information from a gyro would indeed enable a nav package to begin the rerouting process sooner. Correct? I'm also thinking a gyro could be used as sole navigation for tunnels and other GPS dark spots.

OTOH, if the precision of GPS is good, then why does it take so long for a GPS system like TTN6 to discover that I've deviated?
Last edited by jgombos; 2008-02-26 at 20:16.