Mapwork Bearing

This section introduces the concept of calculating a bearing on a map, emphasizing three crucial steps. It starts by defining key compass directions and their corresponding degrees: North (0°/360°), East (90°), South (180°), and West (270°).

Using a map of Thailand, the video demonstrates how to calculate the bearing from Point A to Point B. The first step is to draw a perpendicular line at Point A (the starting point). The second step involves drawing and extending a line connecting Point A to Point B. The third step is to accurately place the protractor's center on Point A, aligning its vertical line with the perpendicular line. Bearings are measured clockwise from North.

This part illustrates how to calculate bearings when the angle exceeds 180°, using a new example from Point B to Point C. The same three steps are followed: draw a perpendicular line at Point B, draw and extend a line to Point C, and correctly place the protractor. For angles greater than 180°, the measurement might require splitting the angle, measuring to 180°, turning the protractor, and adding the remaining measured angle.

An alternative method is presented for calculating larger bearings. Instead of splitting the angle, one can measure the smaller angle counter-clockwise from the 360° mark and subtract it from 360° to get the clockwise bearing. This method provides the same accurate result and highlights the importance of precise protractor placement for accuracy.