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Day Skipper - Part 5 - Dead
reckoning
Having established your position you can then lay off your planned track:
in this case, 110° true.
If you know your speed is ten knots you can predict where you will be
by dead reckoning your position. At ten knots, you will travel one mile
every six minutes. A dead reckoning or DR is shown by a small line at
right angles to the track with the recorded time in minutes. At any time
in the future, a quick glance at your watch will indicate your likely
position from the DR.
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