Garmin StreetPilot
2610
Elevation Measurements
John Beale, Feb. 8 2006
Mountain View, CA
I measured this data indoors over a period of a few hours. The GPS sent
out a reading every second while it had a 3D fix. I have deleted
the
points when it did not have enough satellites in view to generate an
elevation. This was indoors and the unit lost lock on satellites
frequently, so this may be close to a "worst-case" signal situation.
Averaged over
two hours worth of data, the altitude readout of 70 feet is close to
the actual elevation of 78 feet (from USGS topo map).
However, the error at any given time can be quite large.
GPS units with a built-in barometric altimeter can report more
consistently accurate measurements.
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