Using a compass to find your location involves a technique called triangulation. For this to work, you need your map, compass, and at least two visible landmarks, three if you want to be extra ...

This tells you the compass direction you need to travel to reach that landmark, but not necessarily your exact location.

The methods of triangulation which we used to measure the width of the lecture theatre can be used for much larger distances. Accurate maps and the elevations of mountains such as Everest are ...