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Find Your Unknown Location From Two Known Points!
Determine Your Unknown Location!
Resection: This is the process by which you can determine your unknown ground/map location from two known/identified locations on the map. It is critical that the following steps be performed in sequence:
- Orient the map using the compass;
- Identify two or three known distant locations on the ground and mark them on the map;
- Measure the magnetic azimuth to one of the known positions from your location using a compass.
- Convert the magnetic azimuth to a grid azimuth;
- Convert the grid azimuth to a back azimuth. Using a protractor, draw a line for the back azimuth on the map from the known position back toward your unknown position;
- Repeat 3, 4, and 5 for a second position and a third position, if desired;
- The intersection of the lines is your location. Determine the grid coordinates to the desired accuracy.
Accuracy will depend on your ability to use a map. Compass, protractor, and follow the steps listed above.
Find Unknown Point From Two Known Points!
Remove the Guess Work!
Intersection: Locating an unknown point on the map from two known/occupied points on the ground. This map/compass method of determining a location on the map would be used when accuracy is desired and the unknown point is not accessible. The following sequential process would be duplicated:
- Orient the map using the compass;
- Locate and mark your position on the map;
- Determine the magnetic azimuth to the unknown position using the compass;
- Convert the magnetic azimuth to a grid azimuth;
- Using a map protractor, draw a line on the map from your position along this grid azimuth.
- Move to the second known point and repeat steps 1, 2, 3, 4, and 5.
- The location of the unknown position is where the lines cross/intersect. on the map.
- Determine the grid coordinates to the desired accuracy.
Accuracy will depend on your ability to use the map, compass, protractor, and follow the steps listed above.
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