All lines of longitude are true north lines. A line from any point on the earth’s surface to the north pole. The most commonly used are magnetic and grid.Ī. There are three base lines- true north, magnetic north, and grid north. To express direction as a unit of angular measure, there must be a starting point or zero measure and a point of reference These two points designate the base or reference line. In order to measure something, there must always be a starting point or zero measurement. The grad is divided into 100 centesimal minutes (centigrads) and the minute into 100 centesimal seconds (milligrads). There are 400 grads in a circle (a 90-degree right angle equals 100 grads). The grad is a metric unit of measure found on some foreign maps. To convert degrees to mils, multiply degrees by 17.78.Ĭ. A circle equals 6400 mils divided by 360 degrees, or 17.78 mils per degree. A relationship can be established between degrees and mils. The mil expresses the size of an angle formed when a circle is divided into 6,400 angles, with the vertex of the angles at the center of the circle. Another unit of measure, the mil (abbreviated ), is used mainly in artillery, tank, and mortar gunnery. The most common unit of measure is the degree (°) with its subdivisions of minutes (‘) and seconds (“).ī. Directions are expressed as units of angular measure.Ī. Military personnel need a way of expressing direction that is accurate, is adaptable to any part of the world, and has a common unit of measure. It also includes some advanced aspects of map reading, such as intersection, resection, modified resection, and polar plots. It explains the use of some field-expedient methods to find directions, the declination diagram, and the conversion of azimuths from grid to magnetic and vice versa. It explains in detail how to determine the grid and the magnetic azimuths with the use of the protractor and the compass. It can be expressed as right, left, straight ahead, and so forth but then the question arises, “To the right of what?” This chapter defines the word azimuth and the three different norths. Direction plays an important role in a soldier’s everyday life. Here is information on using the Military Grid Reference System (MGRS).Being in the right place at the prescribed time is necessary to successfully accomplish military missions. Here is information on using the United States National Grid (USNG). Here is information on using the Universal Transverse Mercator coordinates (UTM). Here is a tutorial on using this type of tool. Using a slot style tool to plot/measure a 10m MGRS position Part Id: GTA, Made in United States, UPC: 824249150032 Part Id: SuperGTA, Made in United States, UPC: 824249150063Ĭoordinate Scale and Protractor - GTA 5-2-12 Improved Military Style UTM/MGRS Coordinate Scale Part Id: RoundGTA, Made in United States, UPC: 824249150490 Round Military Coordinate Scale and Protractor Part Id: UTMSlot-TA, Made in United States, UPC: 824249000764 Part Id: GridsSheet, Made in United States, UPC: 824249000849 Locating Coordinate Grid Information on USGS Maps It's the size of a music CD, so it tucks away in more storage spaces.Larger print type on both the scales and compass rose.Larger 1:50,000 and 1:100,000 scale rulers for maps with wider grid spacing.Includes 1:24,000 scale for USGS 7.5 minute topographic maps.It’s 33% thicker than the standard military issue version, so it’s less likely to bent or broken when you need to use it. This makes it about the thickness and stiffness of a credit card. The tool is printed on plastic stock with a protective coating.Our coordinate scales offer significant benefits over the standard issue GTA 5-2-12: This makes reading the compass rose easier and also keeps the tool from "disappearing" when you place it on the map. The inner protractor is marked in 90 degree quadrants.īands of white ink are printed under the compass rose. This tool has larger print numbers on both the compass rose and the coordinate scales. Plus, the overall dimensions of the tool have been reduced so that it is the size of a music CD, easily fitting into a pocket or any slot where you could store a CD. The 1:100,000 scale now spans 5km grid lines, making it much more usable. The tool features several additional map scales, including 1:24,000, which is the most common topographic map scale found within the United States. By using a slot on one side of the tool for access to the map, the tool can be more compact than the traditional GTA tool. This tool is an improved version of the Graphic Training Aid 5-2-12 Coordinate Scale and Protractor used by United States and NATO military forces around the world. Neither the red lines, colored background, nor map image are printed on the actual tool. Note: Product edges and interior cutouts are shown with a thin red line.
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