![]() The Army issue square protractor has meter marks from right to left so you need only slide the protractor flush from the right to get a reading of map grid coordinates. Problem are #2: Measuring grid coordinates Placing this string in the center or using the paper edge are not taught in basic enlisted or office training or in Army Field Manuals, either-so several generations of Soldiers are now using bad protractors and are mostly unaware of any techniques to improve their plotting is it a wonder so many Soldiers dred land navigation and express little confidence in their skills? Having dry sheets of paper for this edge is not reliable. Even with a string, the square edge makes it necessary for angled tick marks to be the source of the reading a round compass rose trying to be read off a square piece of plastic! If your azimuth lies in between the tick marks.Another field expedient is to take the straight edge of a sheet of paper, lay it along the two points to be measured and then lay the protractor on top in order to get a reading. The RM protractor as can be seen in the picture here comes with an elastic string that is tied around the outside edge of the protractor for azimuth measuring. 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. Universal bevel protractors are also used by toolmakers as they measure angles by mechanical contact they are classed as mechanical protractors.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. It has wide application in architectural and mechanical drawing, although its use is decreasing with the availability of modern drawing software or CAD. ![]() ![]() Sometimes Vernier scales are attached to give more precise readings. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle.Ī bevel protractor is a graduated circular protractor with one pivoted arm used for measuring or marking off angles. They are used for a variety of mechanical and engineering-related applications, but perhaps the most common use is in geometry lessons in schools. Radian-scale protractors measure angles in radians. Most protractors measure angles in degrees (°). Some more information on Protractors Source: WikipediaĪ protractor is a square, circular or semicircular tool, typically made of transparent plastic or glass, for measuring angles. Easy & Medium Dot-to-Dots 91 91 products.
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