What is required to determine grid coordinates using the map and compass method?

To determine grid coordinates using the map and compass method, conversion of the magnetic azimuth is essential. This process involves adjusting the magnetic bearing observed with a compass to a grid bearing that corresponds to the map's coordinate system. Maps are oriented to a grid, while compasses typically reference magnetic north.

When navigating using a map and compass, the orientation must be aligned properly to ensure accurate readings of azimuths, which will facilitate movement towards a specific grid coordinate. The conversion process helps to mitigate discrepancies caused by magnetic declination, thus ensuring that the route plotted on the map corresponds correctly to the actual terrain.

While observing natural terrain or measuring known distances can be useful skills in navigation, they do not directly relate to the computation of grid coordinates. Similarly, while prior knowledge may provide context or assist in rough navigation, it doesn't provide the precise method needed for determining grid coordinates with the map and compass technique.