Plotting a grid using the 1:50000 scale romer on the RA Protractor. Read of the inner scale and plot a bearing of 4500 mils back to the trig point.Ĭhoose two points on a map and practice this procedure. To plot a backbearing from the church, turn the protractor to the left with the centre point over the church. What is the Grid Bearing from the Trig Point to the Church? The map I’m using is a 1:24,000 scale so I’m going to use the 1:24,000 scale grid on my protractor. Make sure you use the one that matches your map’s scale, or else you’re going to be way off on your plotting. Your protractor will likely have different scale grids. The outer scale is used when plotting bearings East and inner scale for bearings West. To do this, we need to bust out our military protractor. Where the line crosses the outer scale it indicates the Grid Bearing from your position (trig point) to your target (church with tower). Then draw a line or use a plumb line to draw a line from your location (trig point) to your target (church with tower). Welcome to the Best Military Protractors Facebook page, where you will find Map Reading & Land Navigation Aids. A radian scale protractor measures an angle in radians. All vertical and horizontal lines should be aligned with those on the map, overlay the centre point over your location on the map (trig point). Protractor, in math, is considered to be an important measuring instrument that is in the shape of a semi-circle.The common protractor is a translucent tool that helps us measure angles in degrees. This is the issued protractor, the metres scale romers are on the left side, these are the romers that you should use.Įnsure the map is on a flat surface, align the base line with the vertical lines on the map, the 0 should be in line with Grid North. Place the protractor over the map and align the northings and eastings with the zero lines and romer grids.
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