Free Altimeter App for Android

I downloaded this free android app today. Best to have map/compass/gps but if your forgot all that stuff or just want a altimeter type app, I found this to be quite accurate if you have a decent gps fix.

https://play.google.com/store/apps/details?id=com.duerr.ha&hl=en

What apps do you find useful for outdoor adventures?

 

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