GPS time synch

Ian Stirling openmoko at
Tue Feb 20 17:44:33 CET 2007

Perry E. Metzger wrote:
> Michael 'Mickey' Lauer <mickey at> writes:
>>> On Mon, Feb 19, 2007 at 11:47:23PM +1100, Mark Chandler wrote:
>>>> Would it be possible to keep the Neo's internal clock accurate using 
>>>> time stamps from GPS information?
>>> yes.
>> That is only during GPS being powered up, of course. We probably don't
>> want it to be powered unconditionally, since it drains quite some
>> power.
> Out of curiosity, how bad is the GPS power drain? There are
> applications I would like (such as automatically turning the ringer
> back on when the phone is inside my home -- I always forget to do that
> and miss calls) that require location information at reasonably
> frequent intervals...

Based on ballpark estimates from other similar devices, it's probably 
around 70mW.

This will really hurt if you keep it on all the time, fortunately, for 
most applications, you probably don't need to.
If it works at 2s on, 30s off, as seems likely, this alone drains 1/30th 
of the battery per day, which isn't bad. Especially as you can probably 
back off a little if the phone has been stationary for several minutes.

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