[aprssig] GPS/Puck or Other Wise

Jason Winningham jdw at eng.uah.edu
Sun Jul 10 08:46:34 CDT 2005

On Jul 9, 2005, at 4:14 PM, Stephen H. Smith wrote:

>  4)  Why worry about switching the GPS on and off at all?   A device 
> like the Garmin GPS-18 powered by a decent switching mode regulator 
> (not a 7805 linear device) only draws 50-60 mA at 12VDC which 
> translates to about 1 Amp-Hour a day.   You can leave this device on 
> for a week or more without affecting the car battery significantly.  
> The advantage is that the  GPS is always locked  and has a currrent 
> ephemeris and almanac ready-to-go.

I agree with Stephen - just leave the GPS on and let it keep a lock.

I have an old Trimble SV6 (that's powered by a 7805) that stays 
connected in my F150 24x7.  The only time I disconnect it is about once 
a year when I leave for a week's vacation.  The GPS is always powered 
up ready to go.


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