![]() If, for some reason, a reference is required that is unique in the world, one must look in the margin of the map for the Grid Zone Designation. For most purposes this is sufficiently unambiguous. This reference is still not unique, but the same reference does not occur again for about 2,900 km (1,800 miles). Here the church would be in square NT99 and more precisely at point NT9293. Figure 3 shows a reference on a 1:250 000 map (where grid lines are usually identified by a single number). The identifying letters (two of them) are always given before the numbers. This is particularly important in the case of medium- and small-scale maps (1:250 000 and smaller), as unlettered references are ambiguous on a single map. Therefore a method has been devised to identify the 100,000-metre squares by letters which are printed in blue on the face of all NTS maps. The Military Grid Reference System is convenient, but unfortunately reference numbers repeat themselves every 100,000 metres (100 km or about 62 miles). These additional features enable precise measurements and efficient map plotting.Figure 3 is an illustration of reference numbers in blue which makes the unique referencing. 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. Depending on your needs, choose a map protractor that is compact and easily portable.Some protractors may have additional features such as magnifying glasses or rulers for added convenience. Look for a protractor with easy-to-read markings and a comfortable grip. Consider the protractor's design and usability.Accuracy is crucial to ensure your navigation calculations are correct. ![]()
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