1. Adjust for magnetic declination.
2. Find three prominent landmarks in the field.
3. Orient map to true north. See section 6.1, Map Alignment, for help.
4. Find and mark all three landmarks with an ‘X’, and label them ‘1’, ‘2’ and ‘3’. (Fig 22)
5. Sight a field bearing to landmark ‘1’ (320°). See
section 3.1, Forward Sighting
, for help.
6. Place clear base next to landmark ‘1’, on the map.
7. With bearing at 320°, pivot compass around land-
mark ‘1’ until “circle over circle”. (Fig 23)
8. Draw map bearing passing through landmark ‘1’,
using the clear base.
· Your position is somewhere along this line.
9. Repeat process for landmarks ‘2’ (50
o
) and ‘3’ (90
o
).
Either a point or a small triangle
will form at the intersection of the
three lines. Your position is
within the triangle. (Fig 24)
It is also possible to determine
three map bearings using the
compass alignment method (6.2,
Compass Alignment
). This
method uses the map’s true north,
so the map can be positioned any
9
Figure 22
Figure 24
Figure 23
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