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. These additional features enable precise measurements and efficient map plotting.Being in the right place at the prescribed time is necessary to successfully accomplish military missions. Consider a protractor that includes rulers and grids.It allows for better visibility and makes it easier to navigate accurately. A map protractor with a built-in magnifying lens can come in handy, especially when reading small details on a map.This feature ensures you always have your protractor within reach. Some map protractors may have built-in lanyard holes, which allow you to attach them to your backpack or gear.This versatility allows for easy conversion between different measurement systems. Look for a map protractor that offers multiple scales, including Nautical Miles (NM), Statute Miles (SM), and Kilometers (KM).These markings will help you calculate angles and measure distances effectively. Ensure that the protractor has clearly visible and accurate degree markings. To make an informed decision, consider these important features when selecting a map protractor: It should fit in your backpack or pocket without adding unnecessary weight.
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