From what you describe it sounds like you're running into GPS' flaw.. Directionality can only be determined when you are moving.. Once you stop it can't tell what direction you are facing and it will start to shift based on the satellite drift.. Takes a little time, and doesn't always happen as some receivers are able to detect that you're not moving and not change direction until you do (this is why some gpses have a 'time not moving' stat).
If you have a display on the gps you should be able to see it happening as the map will start changing direction.. The Nuvi 350 does this, especially when there's buildings around so you're dealing with reflections. p Quoting Chris <[email protected]>: > > > --- In [email protected], James Ewen <ve6...@...> wrote: >> >> On Wed, Jul 28, 2010 at 7:24 PM, Chris <wellre...@...> wrote: >> >> >However, since I don't know the details of the turning algorithm I >> > can only guess how to avoid this boundary condition. >> > >> > Can anyone shed some light on this? >> >> http://www.hamhud.net/hh2/smartbeacon.html >> >> James >> VE6SRV >> > Thanks, I looked at the HamHud description. I did not see anything > that would account for sudden onset rapid beaconing when the vehicle > is parked. The turning algorithim in the T2 also seems to be > implemented slightly differently than that of HamHud (At least from > the standpoint of the number of parameters required to specify a > turn event). > > > > > ------------------------------------ > > Yahoo! Groups Links > > >
