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DAY'S WORK

Example 2.-A ship had Fire Island light bearing N. N. E. distant 10-50 miles, ship's head S. 1⁄2 W. Variation 10° 00' W. Deviations as per table on page 16. Throughout the 24 hours a current set N. E. magnetic and its drift % mile per hour. The ship was sailed as follows:

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Find the course and distance made good and the ship's position. From that point find the course and distance to Cape Henry light.

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Middle lat. 39°1⁄2 dep. 168′.0= dif. long. 217′.5=3° 37′ 30′′ E.

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PRACTICAL DEAD RECKONING

The traverse table is not used in the practice of navigation, but its use must be learned that more practical means may be used to keep account of a ship's track.

Usually the following method is not wanted at an examination, but should be used in practice. The former is quite satisfactory so far as the final result is concerned, which is not known until the end of the day. By this the ship's position may be known at any moment. In other words, by one the ship takes the man and by the other the man takes the ship.

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Dif. (current)

+

=

17.2 N. 38 dep. 12.0 dif. (current)

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Lat. noon

38

35.0 N.

Long. noon

I 13.6 E. 69 50.3 W.

15.2 E.

69 35.1 W.

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