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25 Cards in this Set
- Front
- Back
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You are standing in the vicinity of several prominent features which can easily be located on the map.
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Location by inspection
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By orienting the map and estimating your relation to these features, you should have no difficulty in determining your location.
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Location by inspection
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Is an accurate technique of determining your location when you are on or near a linear feature that you can identify both on the ground and on the map
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Location by One -Point – Resection
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You must also be able to identify another prominent feature, both on ground and on the map.
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Location by One -Point – Resection
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- Identify a prominent feature on the ground and locate that feature on your map.
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Location by One -Point – Resection
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- Using the compass-to-cheek technique, sight in on the feature and read the magnetic azimuth
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Location by One -Point – Resection
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- Convert the magnetic azimuth to a grid azimuth.
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Location by One -Point – Resection
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- Convert this grid azimuth to a grid back azimuth.
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Location by One -Point – Resection
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- With your protractor, plot this grid back azimuth from the feature on the map and extend it until it crosses the linear feature.
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Location by One -Point – Resection
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- Conduct a map inspection to verify your resection.
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Location by One -Point – Resection
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- When selecting a terrain feature, choose one that is perpendicular to the axis of the linear terrain feature so that when you plot the back azimuth on the map, the line will cross the linear feature more or less at a right angle.
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Location by One -Point – Resection
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Usually you will find that you are not located on or near a prominent linear feature.
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Location by Two -Point – Resection
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Since the accuracy of a one-point resection under these conditions depends on your ability to accurately estimate distance, it is better to use a two-point resection.
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Location by Two -Point – Resection
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The procedures for two-point resections are basically the same as for one-point resections except you must select two features instead of one.
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Location by Two -Point – Resection
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The back azimuths from each feature is determined and plotted on your map.
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Location by Two -Point – Resection
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You are located at the point where these lines cross
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Location by Two -Point – Resection
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If you have a compass and a protractor then follow these steps.
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Location by Two -Point – Resection
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- Select two prominent features on the ground whose positions can be located on the map
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Location by Two -Point – Resection
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These features should be at least 30 degrees but not greater that 150 degrees apart
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Location by Two -Point – Resection
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- Using the compass-to-cheek technique, determine the magnetic azimuth to each object
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Location by Two -Point – Resection
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- Convert these magnetic azimuths to grid back azimuths.
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Location by Two -Point – Resection
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- With your protractor, draw the respective back azimuths from these two points on your map.
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Location by Two -Point – Resection
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- Extend the azimuth lines from these two points until they intersect.
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Location by Two -Point – Resection
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You are located at the point where these two lines cross.
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Location by Two -Point – Resection
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- Conduct a map inspection to verify your position
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Location by Two -Point – Resection
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