[gps-talkusers] Earthmate to Map Calibration

I have now noticed a consistent difference, or should I say offset, between
the GPS position and the defined POI position.  This has been observed in
three different locations as much as 200 miles apart in location.  Let me
use today's example to explain.
After dining at a restaurant, I was sitting outside waiting for a cab.
While sitting there I decided to investigate what was around me.  With the
Earthmate turned on and indicating that it was picking up 7 satellites I
pressed f and then enter to search for the poi's nearest me.  In going down
the list, I came across the restaurant I was sitting in front of.  I set
this poi as my virtual position and checked the difference between the GPS
and virtual position.  The response was that the poi was 981 feet southwest
of the GPS position.  As I said earlier, I have done this two other times in
locations as far away from where I was today by as much as 200 miles
(specifically Fresno, Emeryville, and Novato, CA.) always with almost the
exact same results.  Could the Earthmate be out of calibration, or there be
some sort of offset being interpreted from the maps by the Braille note?  Is
there any way I can close this offset?
Rich Irwin
rich.irwin@xxxxxxxxxxx

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