Select a specific location for the map creation. Draw a straight line in the center for its convenience. Ten or twelve paces * will suffice. Place a table in the center of the document and make sure the map paper on it does not change direction. Draw a straight line on a piece of paper proportional to the line drawn on the ground (the scale should be prepared according to the size of the paper). Take the bearing ** for each object from line A to point B. Draw an angle from points A and B in the figure with a level in the same bearing. The location of the object is where the lines meet. Thus find the angle to each object. Once you have documented the important objects around you, draw them together. Mark the direction.

Observe the figure – Triangulation method

* • Pace – A pace is the distance between the front of one foot and the front of the other foot as we normally walk. After walking ten steps, the correct method is to divide the total axis by ten and see the average. Understanding this will help in estimating and mapping.

Compass Setting – Usually the north side of the compass magnet is marked separately. The compass setting is used to keep the compass stationary so that this north side and the north side of the compass dial are facing in the same direction. The compass should be placed on a flat surface when set.

** • Bearing – The bearing is the clockwise angle between an object and the observer’s line of sight based on the north direction of the compass.

Back bearing – Back bearing is the bearing from object to position. The back bearing is taken to see if the bearing taken is correct.

ReferenceAPRO Part II,. APRO Part III., Triangulation method explained

Gopikrishnan T S
Author: Gopikrishnan T S

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