![]() ![]() No math needed unless you are metric Luddite. Using the 1:24,000 scale, you can see the total length of the scale is 1 kilometer, major tick marks are 100 meters, and minor tick marks are 10 meters. My map protractor has 4 scales in the center: ![]() ![]() If we divide 24,000 by 12 (12 inches in a foot), we would get 2,000 feet - meaning 1″ on the map equals 2,000′ feet on the ground.īut since you have a map protractor, it can measure for you. Of course inches isn’t a good “on the ground” measurement. If you had a ruler, you could measure the kilometer or the miles scale and then measure the distance on the map and calculate. So 1″ on the map is equal to 24,000″ on the ground. is equal to 24,000 of the same measurement on the ground. What this means is a measurement on the map, be it inches, feet, millimeters, etc. The most common map, the 7.5 minute map has a scale of 1:24,000. Measuring DistancesĮvery USGS Topographical Map has a scale printed at the bottom of the map. For more information on compensating for declination read Part 1 and Part 2. In the picture above, the string shows our bearing as 55˚. The string will pass under the bearing reading. Align the map protractor along a north/south gridline, while stringing you line on top of points A and B. Tie a knot in one end of the string, and thread the other end through the center hole in the map protractor. No problemo! All you need is a piece of string, thin tent guyline, thread, or even dental floss. No Pencil or Straight Edge?īut what if you don’t have a straight edge and/or a writing instrument to draw a line? Then the map protractor is used to determine your bearing. If you recall, the first step is to draw a line between two points, A and B, A being your starting point and B your destination. In the post Set Up Your Compass Faster & More Accurately With A Map ProtractorI showed the readers how to navigate quicker and more accurately with a map and any compass using a map protractor. ![]()
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