A free program for iPhone, by Dayana Networks Ltd.

My Altitude is a simple and useful app to help you get to know the altitude of your location. It displays your current location, latitude, longitude, altitude, pressure, and boiling point. This application does not need an internet connection, so it works best in an outdoors environment.

My Altitude can get a barometric pressure and boiling point based on the current location. On newer devices, such as iPhone 6/6+ devices, the barometric pressure is being delivered directly from the device’s built-in sensor, this behavior can be switched back to calculation mode.

It also allows you to get a picture of where you are and save it in a photo album.