Delta Altitude is a handy tool for calculating the difference in altitude between two points on a map. Simply tap the map to find out how high up you are or how much lower your location is than the other point.

The application uses a number of different sources for its data, including the NASA Shuttle Radar Topography (SRT) mission, which uses the data from a series of U.S. Air Force and NASA satellites, and the UK Met Office Global Terrain Project, which uses a combination of satellite and ground-based surveying.

In addition to providing an altitude difference, Delta Altitude can also provide the elevation of the two points.