You'll Never Get Lost Again by Singleton Robert;

Author:Singleton, Robert;
Language: eng
Format: epub
Publisher: Atlantic Publishing Group
Published: 2018-04-24T16:26:03+00:00

Of all the terms used in navigation, dead reckoning is the least understood, yet probably the easiest to explain. In a movie about Charles Lindbergh’s epic solo flight across the Atlantic, Jimmy Stewart says the only thing wrong with dead reckoning is the word ‘dead.’ I agree. This term somehow evolved from the term deduced reckoning, which came from an era in which ships were made of wood and the men who sailed in them were supposedly made of iron.

Dead reckoning is a method of approximating your position by knowing how much ground you covered in a certain amount of time from a known starting position. Remember in an earlier exercise, I asked you to time yourself and find out approximately how fast you travel over different types of terrain. That information is the basis for determining a dead reckoning position. By knowing how fast you generally travel and how long you have traveled, you can estimate how far you have traveled from a specific location. Should you following a compass course outline on your survey map, you will be able to determine your position.

For example, let’s say you left Joe’s Bar and Grill at noon and you are traveling two miles per hour on a compass course of 270-degrees. The terrain is flat forest country, and you have very few landmarks to help you find your position. At the end of two hours, you want to see approximately where you are on the map. You know that after two hours you have traveled four miles.

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