Brunton ECLIPSE 8099 Manual De Instrucciones página 7

The topo-map is now aligned with true north. In the field, it is possible to compare the map to
the actual terrain. Now, find the map bearing from one position to another.
6. Place a "point" at a starting position and an "X" at a destination.
7. Draw a line connecting the "point" and the "X".
8. Open the cover and sight cover as far as possible.
9. With both covers pointing to the "X", position clear base next to the line (figure 17).
· Do not move the map.
Figure 17
This bearing is the map bearing from the starting "point" (Camp) to the destination (Carrie's
Cave). Use this compass bearing, in the field, to find Carrie's Cave from the Camp.
7.2 Compass Alignment
Another way of finding a map bearing is using the compass alignment method. This method
allows for quick bearing determination, without aligning the map to true north. Use this method
for pre-planning at home, at base camp, or in the office. The following example uses a USGS
topo-map, where the left and right margins are aligned to true north.
1. Remove rubber shoe.
2. Adjust compass for magnetic declination.
3. Set a long straight edge next to the map's margin line (running true north-south).
4. Using a pencil, lightly draw a true north-south line from the bottom to the top of the map.
10. Rotate azimuth ring until
circle outlines the red circled "N"
(figure 18)
11. Read bearing at the magnified index
line from the green scale (figure 18).
10
blue orienting
Figure 18