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...
Too many ads — I get that it's free, and I get that it needs ads to support it, but does it have to have such large ads or so many? But it does what it says it does...