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How to use a compass to find out where you are on the map

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One of the main functions of a compass is to identify your location. Particularly useful if you're a bit lost or need to summon help.
What you'll need: 
A compass (the plastic see-through hiking type is recommended)
A map (In the UK, Ordnance Survey maps are recommended for walkers)
A pencil
An eraser
A ruler (optional)
1: 
In your surrounding scenery, find two obvious static landmarks that will be identifiable on the map. They don’t have to be particularly close; on or near the horizon is perfectly fine. If you can't find two, move to a place where you can.
2: 
Seek and identify those landmarks on your map, and mark them with a pencil. This may take a few minutes if you are completely disoriented.
3: 
Point the arrow on the base plate of the compass as precisely as possible at one of the landmarks.
4: 
Keeping the base arrow pointed at the landmark, rotate the circular housing until the North (N) mark is aligned with the red part of the needle.
5: 
Put the compass on the map, close to the landmark you were pointing at.
6: 
Rotate the map until the printed vertical grid lines are aligned with the red needle. There will usually be lines in the bottom of the circular needle housing that run parallel to the North/South marks; these should now be parallel to the needle with the needle (red part) pointing to the North (N) mark.
7: 
Keeping the compass and map in the same orientation move the compass to bring one of its long edges (of the base plate) right up to the pencilled landmark.
8: 
Draw a line (lightly! You will want to rub it out later) using the side of the compass.
9: 
Repeat steps 3 to 8 for the second landmark.
10: 
The two lines drawn may already be crossing each other. If not, extend the lines until they are. A ruler may be needed to extend the lines accurately. When the two lines are crossed, have a look at the map where they intersect. That's where you are!
Conclusion: 
By using this simple triangulation method, you should be able to identify your location to a reasonable level of accuracy. Having done so, you will be able to orient yourself and more easily decide what to do and where to go next...
Tips: 
Be as accurate as you can when taking your bearings.
If the landmarks you choose turn out to be be 'off map' look for things behind you.
Familiarise yourself with the map symbols for your map. Check the reference below for OS symbols.
Warnings: 
Make sure the items you point your compass at are permanently stationary. Sleeping sheep may move, and aren't shown on maps.
Magnetic North, as indicated by a compass, is slightly adrift of True North and Grid North (map vertical) and is always shifting by tiny amounts. Good maps will provide information to allow for this adjustment. In general though, over short distances this issue is not one to worry about.

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