Our bearing is the arc in red in the diagram above and it is co-interior to the angle marked 120 degrees. Co-interior angles on parallel lines add up to 180 degrees. So our bearing of Y from X is 180-120 = 60 degrees. Since we usually write true bearings as three digits we would say it is 060°T. How to work out true bearings. True bearing: Starting at North rotate in a clockwise direction. $360^\circ-47^\circ=313^\circ$ 3 6 0. Think: It will be easiest to first visualise the situation by drawing a diagram, such as this one: For the three-figure bearing, the angle we want to find has been marked.
![[DIAGRAM] Diagram Of True Bearing](https://i.ytimg.com/vi/HVV1bZDCWxI/maxresdefault.jpg "[DIAGRAM] Diagram Of True Bearing")
![[DIAGRAM] Diagram Of True Bearing](https://d2vlcm61l7u1fs.cloudfront.net/media/b28/b285e8a3-43d9-4693-a9b1-2cfee34c11c1/phplSm1Kk.png "[DIAGRAM] Diagram Of True Bearing")
If the magnetic declination at a place at the time of observation is known, the true bearing of a line can be calculated from its magnetic bearing and vice-versa. Determination of True Bearing From Magnetic Bearing Rules. The following rules are applied to determine the true bearing if the magnetic declination is known: 1. If Declination is.. 1. Find the bearing of each of the following directions: (a) S (b) NE (c) N (d) NW 2. Find the bearing of each of the following directions: (a) N600E (b) N350E (c) N900W (d) S400E 3. Draw a scale diagram to show the position of a ship which is 270 km away from a port on a bearing of 110o. Situation of Integration