| Triangulation |
| Triangulation is a way of using the compass and
map to fix your position. There will be times when you are not
sure of your exact position, or indeed when you are completely
and utterly lost! If you a map of the local area and you can
see some prominent features then you can use the map and compass
together to pin down where you are. |
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Darren Dowling
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Connected is a central area that provides links to obtain
further information on subjects contained in Scouting Resources.
From here you can go on to websites related to your area of
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| Triangulation |
Darren Dowling
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You must first make sure you can identify several landmarks
(at least 3 to on the safe side) both in real life and on
the map. If you were to set up the map then you will find
this task a little easier. Try to find landmarks that are
evenly spaced. For example if you can see 3 prominent features
try to pick ones that are about 120° apart. This will
cut down on errors.
- Locate 3 prominent features approx. 120° apart
- Work out the bearing of one of the features.
- Find the feature on the map
- Place the compass on the map so that the edge of the compass
points towards the feature.
- Rotate the entire compass until the meridian orienteering
lines (the faint blue lines marked on the dial itself) are
aligned with north on the map (e.g. a vertical blue grid
line on the map). Note: This method
has NOT taken magnetic variation into account and this may
produce a serious error depending upon your position on
the Earth.
- Draw a line from the feature back towards your position
(you should be on this line somewhere).
- Now repeat all of the above for the other landmarks.
- Your approximate position should be where the lines intersect.
In practice if you have taken 3 readings then the lines
will produce a triangle ( in theory they should intersect
but this rarely happens in practice!). Your position is
somewhere within the triangle (hence why the process is
called triangulation)
If you know your position to be on a easy to recognise feature
(e.g. you are standing on top of a hill, in a stream or better
still in a pub) then only one or two bearings should be needed.
Simply look at where your line crosses the hill crest, stream
or bar.
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