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On Sat, Jul 12, 2008 at 08:11:45PM +0800, William Kenworthy wrote:

quoted text
> 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?

>=20

> 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

>=20

> 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.

>=20

> 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.

>=20

> 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.

>=20

> 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.=20
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