Two knots secures the string to the protractor center but creates a bulge so the protractor will not lay flat on your military topographic map. It takes a 1:50,000 scale map distance of 1,800 meters just to reach the protractor's square edge to get a reading.Īnother self-help technique is to poke a hole in the center and place a knotted string in the center to overlap extend over your map lines for a reading, but this leaves a knot in the center, obscuring the center placement of the original point to be measured from and the string can fall out at the worst possible time. You lose the mills scale for artillery calls for fire and still have to draw extended lines on your map, cluttering and obscuring important details. Often hand trimming of the mils edge results in a sloppy, uneven edge cutting off degree marks. When measuring a grid angle from point A to point B on a map with the Army protractor, you are often forced to draw and extended line so you can reach the square's edge for a measurement! An improvement somewhat is to trim the mils scale off, but not a significant enough improvement. The RM protractor is round with degrees and mils scales on the outside edge. Army protractor (GTA 5-2-12) is a square shaped piece of clear plastic with mils scale and degrees on the outside edge of the square. Army SNCO, Rudy Madayag and offered in military clothing sales stores (MCSS) is far superior, easier to use and more accurate. ![]() The round and improved square map protractors produced by retired U.S. Finally, use the bottom edge of the protractor as a straight edge to draw a line between the two points.The current square issue map protractor ( GTA 5-2-12 ) is cumbersome to use, resulting in added time in planning, and inherently inaccurate resulting in map errors that can cause units to get lost and rounds to fall on friendly forces. Rotate the protractor and line the bottom edge up between the vertex and the small dot. Now, find the hash mark on the protractor that corresponds with the angle you want to draw, and draw a small dot outside of it. Then, line the bottom edge of the protractor up with the vertex and draw a straight line along it. Draw a small dot in the hole on the protractor to mark the vertex. To draw an angle with a protractor, first place the center point along the bottom edge of the protractor where you want the vertex of the angle to be. If the angle is facing left, use the top row of numbers. If the angle is facing to the right, use the bottom row of numbers on the protractor. Follow the other leg of the angle up to the protractor’s arc to see what number it intersects with and find the degree of the angle. ![]() Line up the bottom edge of the protractor with one leg of the angle. To measure angles with a protractor, first place the center point along the bottom edge of the protractor over the vertex of the angle you're measuring. You can use a protractor to measure and draw angles. ![]() The 2 measurement scales on the protractor makes this tool handy for measuring angles that open up from either direction.If your ray falls in between 2 whole numbers, like 50° and 60°, just count the lines to find your angle’s exact measurement. Protractors typically label measurements in 10s, but between each number are little lines that represent 1°.Or, line the edge of a piece of paper along the line. If the line doesn’t extend past the protractor’s arc, lengthen it with a ruler.If this angle opened from the left, you’d use the outer scale.We know to use the scale on the inside because the measurements are increasing as you move towards the line and they’re less than 90°. In the above image, the angle opens up to the right and is acute.The number that the ray passes through is your angle’s measurement in degrees. If your angle is obtuse, use the scale with measurements greater than 90°. ![]() If it’s an acute angle, make sure you’re looking at the measurements that are less than 90°. Use the scale measurements that are increasing in the direction that your angle is opening up in. Follow the other ray up to the measurements on the protractor's arc.
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