On Sat, Jul 12, 2008 at 08:11:45PM +0800, William Kenworthy wrote: > Does it make any difference to leave the gps running 15 minutes plus > (probably a few multiples of 15 minutes is best) then power off for a > few minutes and then back on? > > My freerunner isnt here yet, but my experience on a cheap bluetooth gps > that I though just had occasional conniptions was actually operating > according to design > > On the first fix (or a fix after a few weeks on the shelf powered off), > it would take some time (once being over a day with poor signal) to get > a fix, after which it would be fine getting a nearly instant fix on > startup. > > Turns out the device needs information downloaded from a satellite and > can take ~13 minutes to do so. And at least one article mentioned that > any problem/lost/corrupted data caused it to start again at the next > start point. So if you have a poor signal, something blocks it at a > critical point, you can scratch that 15 minutes. > > As the freerunner has come straight from the factory, probably with none > of this data, it will need at least 15 minutes with a good signal to get > its data up to date. This data is also valid for 6 weeks which explains > the erratic operation after extended periods of non-use of my bluetooth > unit. > > Learnt a lot reading up on this :) > A good thread! > BillK
Funny... my experience has been completely contrary to this. When I first tried GPS, it got a fix within minutes at the open window. I then installed gpsdrive and did some other stuff. I did not get a fix anymore. I undid the software changes by starting from a fresh reflash. But i never got a fix again. Today I tried outside 15min with antenna faced skywards. agpsui signal strength display did not show any activity. Don't know it made it work the very first time.
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