Version 1 May 2006
Whenever you determine your present position on the map this is known as a fix. It is a good practice in ballooning to fix your position every ten minutes or so, and to pencil it on the map if you are in an unfamiliar area. If you are momentarily lost (it happens to the best of pilots at times), you can estimate your current position from your last fix. The process of calculating where you expect to be after a specified time, starting from your present position and considering the wind speed and direction, is called dead reckoning (from ‘deductive reckoning’– does not mean it will be ‘dead accurate’!).
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ABF Pilot Training Manual Part 8
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