iAltimeter is an application pretty, simple, accurate, and efficient. It lets you easily know what altitude you are. Contrary to standard applications (with predefined cities), this version of the altimeter will give you precisely the altitude of where you are. It integrates its own conversion system.
A very practical application to a minimum price, why not indulge?
Exclusive: Available in english, french, german, spanish, italian, portuguese and dutch.

(To access all the functionalities of the station your iPhone must be connected to the internet (Edge, 3G or WiFi)).