Real nice for hiking.

I just climbed a Colorado 14er yesterday and downloaded this app to keep track of my altitude. It was off by less than 100 feet the whole time and kept up with my buddys $90 altimeter he just bought from REI. Plus, the whole time I had no cell service at all; it was strictly GPS. Pretty incredible if you ask me. Also, we were driving to a trail that our info gave us the longitude and latitude for, and this app nailed it.
If youre using this in a hiking/outdoor setting this app is beyond worth the 99 cents.

DuckyCO about Digital Altimeter