Many users are contacting us with the question why an altitude value is negative for their tracks. In the most cases this is a normal situation and not an error!
This happens because GPS receiver obtains an altitude value comparative to sea level but not to a ground level. At some places of the Earth ground level is lower than sea level. The lowest point of the surface of the Earth on dry land is the Dead Sea in Israel. It is 422 meters (1,385 ft) below sea level.
But sometimes GPS receiver itself can wrongly obtain negative value of altitude comparative to sea level. For more accurate fixing position in 3D mode at least 4 satellites required. That’s why when connection to satellites is bad, GPS receiver can work in 2D mode obtaining wrong value of altitude (elevation). To fix it find open territory and wait for a least 4 satellites found. Or purchase high-end GPS receiver.
As usual, please feel free to contact us if you need any assistance with our software.