How to use a compass

Learning how to use a compass is an important outdoor skill; not just for walkers, but cyclists and runners too. It's good to take a compass with you, but even better if you know what to do with it.

Our guide to using a compass gives you the basic skills, hopefully without over-complicating things.

Why do you need a compass?
A compass helps you to find where you are and find your way; this is very useful but can be critical if you get lost and visibility is poor. The main ways you use a compass are:

• 'Setting' the map with the compass so that it matches what you see on the ground, and that you're pointing in the right direction.
• Taking a bearing from the map and walking on a bearing (direction)
• Using a bearing to identify features on the ground by checking the bearing from where you are.
• Identifying your own position using 'back bearings' from two or more distant known features (also known as 'resectioning').

Compass features come in many designs, but most compass features are the same as those found in an all-time classic compass like the Silva Ranger. You need to make use of some or all of the compass features for different tasks.

Before you can use a compass to navigate you need to be familiar with the main features.

1. Baseplate - the plastic base.
2. Compass housing - also known as the compass wheel, with a mark every two degrees covering 360 degrees, and N-S-E-W (the 'cardinal points').
3. Magnetic needle - red end for north, white for south.
4. Compass lines - on the bottom of the baseplate (also called 'orienting lines'.
5. Orienting arrow - fixed and aligned to north within the compass housing
6. Index line - extension of the direction of travel arrow.
7. Direction of travel arrow - the big arrow at the end of the baseplate.
8. Map scales 1:25 000, 1:50 000 and metric measurer (known as Romer scales).

The main working part of a compass is the magnetic 'needle' that floats on a central pivot. The red end always points to the Earth's magnetic north pole and the outer ring is marked with the cardinal points of the compass (N-S-E-W) and every 2 degrees. These markings are used to get bearings (the direction from where you are, to where you want to go).

If you rotate the ring to line-up the red north of the needle to the red arrow on the baseplate, a bearing can be be taken from the compass ring.

Find navigation tools at Coleman.com