Wheredroid PLUS VERSION is a simple application to display your coordinates from the GPS receiver: latitude, longitude, heading, speed, number of satellites and (it's its peculiarity) altitude and accuracy.
Altitude may be unavailable on some models (I tested it on Samsung Galaxy S and it works, even if it is less accurate than the one received by my tomtom). The PLUS version, with respecto to the FREE version, is ads-free.
With version 1.1.0, it is quite usable as a compass and an altimeter.
version 1.05.00 adds measurement of vertical speed
Version 1.07.00 adds the possibility to upload position to Ilpiola Mobile device tracker (http://m.ilpiola.it/t)