Transcript GRID BEARINGS

GRID BEARINGS
Grid North is the northern
direction of the north-south grid
lines on a map.
Bearings measured from Grid
North are called grid
bearings.
EASTINGS
GRID
BEARING
Grid bearings are measured
clockwise from a fixed zero
line, or from any easting.
Grid bearings are measured
with a protractor or compass.
405.11 Silver Star
OHP-1
MEASURING A GRID BEARING WITH A
PROTRACTOR
1. Identify start and finish points.
2. Draw a line, or plotting ray,
from Point A to Point B.
3. Place the center hole of the
protractor where the plotting
ray intersects an easting.
•
Lengthen plotting ray past
protractor edge.
•
Ensure graduations under
6. Align the protractor’s center
line directly over the easting.
7. Read the grid bearing off the
protractor where the plotting
ray passes beneath it.
405.11 Silver Star
OHP-2
MEASURING A GRID BEARING WITH A
COMPASS
1. Set the declination to zero.
2. Draw a plotting ray from your
location (A) to your destination (B).
3. Lay the compass along the
plotting ray. Ensure that the cover
points in the direction you are going.
4. Turn the compass dial until the
compass meridian lines are parallel
with the eastings and north on the
compass indicates north on the map.
5. Read the bearing at the index
pointer.
405.11 Silver Star
OHP-3