This altimeter delivers the altitude of your current position either from the device (GPS)
or from the
ASTER
digital elevation model (with a horizontal accuracy of 30m).
Depending on your current position and your device one of the two methods is more
correct. Using GPS on the device is known for a large error in the altitude for difficult
receiver conditions it's not available for network based positioning at all.
Uses the
GeoNames
database for the ASTER data.
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