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Bearings Taking bearings from a compass and using them on a map is
fairly straightforward. Setting the map to North To set your map to north, find a flat area to place your
map (away from metallic objects). You will need to know what the local
Grid Magnetic Angle is first. This is found at the foot of OS Landranger
Maps. Align the GMA value (6° for example) with the direction arrow on
the compass. Turn the map and compass together until the red needle points
to N on the compass. Your map will now be aligned with Grid North
and hopefully you will be able to identify features - unless you're in
fog or clouds! Setting a Compass bearing to a Map If you are ever unsure as to whether your map is aligned
correctly, you can double check by taking a bearing from a visible reference
point and convert it to a map bearing. Point the compass' direction arrow toward your reference
point and while keeping the compass still, turn the compass capsule until
the orienting arrow is aligned with the N on the compass. Now deduct
the GMA which will give you the grid bearing. Now placing your compass on the map with the long edge passing
through your current location (hopefully you know this bit!) then rotate
the compass around your position until the orienting lines inside the
capsule align with the grid lines with the orienting arrow pointing to
the north of the map. If you follow along the edge of the compass which is on
your position, it should pass through, or at least point towards, your
chosen reference point. Contributor: acec Submit your entries to the Wiki! Simply regeister for an account and get started. See the help page on how to get started |
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