The first stage of navigating with a map and compass involves working out your grid bearing. Here’s how it’s done.
Note that the magnetic needle of the compass is not relevant when taking a grid bearing.
Step 1: Place the compass on the map so that the long edge of the baseplate lines up point A (where you are) with point B (where you want to go), ensuring that the direction of travel arrow marked on the baseplate points in the direction you want to go.
Step 2: Rotate the circular bezel of the compass housing so that the orienting lines are aligned with the vertical north-south grid lines of the map, ensuring that the red orienting arrow is pointing towards north on the map.
Your grid bearing is the number on the circular bezel that is now lined up with the index line (which is an extension of the direction of travel arrow).
Note: Before you set off, you will need to convert the grid bearing to a magnetic bearing. Check out this post for more information on adjusting for the grid magnetic angle.
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Whether you take a magnetic bearing in the field and want to use that bearing to determine your position on your map, or you take a grid bearing on your map and want to use that bearing to find your direction in the field, you will need to make an adjustment to allow for the grid magnetic angle. This is how to do it.
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The first stage of navigating with a map and compass involves working out your grid bearing. Here’s how it’s done.
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