This article discusses how to use a compass take a bearing from the map and get you walking in the right direction.
First things first: Before you bring the compass into use, decide whether you actually need to take a bearing or whether it might be easier to reach your destination by simply following the map. It’s only of limited use to learn how to use a compass if you can’t read a map properly in the first place. A compass is a great tool that is simple to use, extremely reliable, needs no batteries and has a variety of different uses, but in order to get the best out of it you really need to be able to confidently relate what you’re seeing on the map to what’s visible in the landscape and vice versa. The first and most important stage in learning to navigate is map reading itself and if you’re good at this, you’re unlikely to get into trouble and the compass will stay in your pocket for most of time.
That said, let’s discuss how you can take a bearing from the map, starting with an overview of the features of a compass:
The Compass

1: Compass Baseplate
2: Direction of Travel Arrow
3: North Orienting Arrow
4: Compass Housing
5: Baseplate Internal Lines
6: Compass Needle (red points north)
7: Orienting Lines
Stage One
Let’s assume we want to walk on a bearing from the summit trig point of Cross Fell (A) to Greg’s Hut (B) on the map below:

Place the compass on the map with the direction of travel arrow pointing towards your destination. Ensure that one of the inner lines of the base plate passes through your origin (A) and destination (B) – this is more accurate than using the edge of the baseplate.

Whilst holding the compass firmly in place on the map to ensure that the baseplate does not slip (I find it best to go down on one knee and use my bent knee as a firm base to press the compass and map against), rotate the compass housing until the north orienting arrow lines up with north on the map. Use the parallel orienting lines in the compass housing and the grid lines on the map to help you. This can be tricky as it is not always easy to see a suitable north-south grid line underneath the compass, so it may need a little adjustment to get everything lined up properly.
When you have lined up the compass correctly, your bearing will be the reading on the housing where the index line crosses the dial (18° in the example above).
Stage Two
After you’re confident you’ve lined everything up with the map as precisely as possible, put the map down to one side and hold the compass directly in front of you at waist height. This is where you now need to look at the compass needle. Shuffle around until the red compass needle (north) coincides with the red north orienting arrow in the compass housing.
With the north needle of the compass and the north orienting arrow lined up, the direction of travel arrow on the compass baseplate is now pointing in the direction that you should walk towards your destination.

- It’s good to get into the habit of anticipating what your likely bearing is going to be before you place the compass on the map(with practice, you should be able to estimate within 10° accuracy), then if your resulting reading varies significantly from your anticipated reading you’ll know that something is not quite right and you should re-do the bearing.
- This method does not take factor in magnetic variation, which is the difference between magnetic north and grid north. However, this variation is so minimal (currently around 2° in the UK) that, as long as you keep your bearing distances shorter than 500 metres, in my experience it makes a negligible difference to your resulting bearing.

