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Examples with Leeway
Take the courses as given on page 334 and proceed as follows-

N
NOTE.—Leeway is associated with
heavy weather and in heavy weather
a course cannot be steered to degrees
—therefore, both course and leeway
are generally expressed in points.
Having first corrected the course for

W

E leeway proceed as before.

Compass Co. East, leeway pt., wind S.S.E. If the ship's head is E. and the wind S.S.E. it must press on starboard side and force her to the left or northward, therefore

S

This fig. represents a compass. Compass Co. E. or N. 8 pts. E.

Wind S.S.E., therefore, allow leeway to Leeway i pts.

the left. N. zi pts. E.

N. 81° 34' E. then, if the var. is 10° W. and dev. 10° W., Error

W.
The true course would be N. 61 34 E.

20

Compass Co.N.N.E.

Leeway

+ 8

N. 2 pts. E. Wind N.W., Port tack, therefore, allow
I pt.

leeway to the right.
N. 3 pts. E. = N. 33° 45' E. Var. 10° E. Dev, 2° W.
Error

Error 8° E.
True Co. = N. 41 45 E.
N. 4 pts. W. Wind X.N.E., Starboard tack, therefore,
2 pts.

allow leeway to the left.
N. 6 pts. W. = N. 67° 30' W.

N. 67° 30' W. Var. 20° E. Dev. 2° W. Error - 18 E. Error = 18° E.

Compass Co. N.W. =

Leeway

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Leeway

Compass Co. S.E. = 5.4 pts. E. Wind S.S.W., Starboard tack, therefore, Leeway 1 pts.

allow leeway to the left. S. 5 pts. E. = S. 61° 53' E. Var. 12' 30" W. Dev. 10°E. Error + 2 30 W.

Error 2° 30'W. True Co. = S. 64 23 E. Compass Co. W.S.W. = 5.6 pts. W. Wind south, Port tack, therefore, allow

2 pts.

leeway to the right.
S. 82 pts. W.; that is, 1 pt. in excess of W., therefore

N. 71 pts. W. = 84° 23'.
N. 84° 23' W.

Var. 30° 15' W.

Dev. 20° 15' W.
Error
+ 50 30 W.

Error 50° 30' W.
N. 134 53 W.

Iso 00
True Co. S. 45 07 W.

Compass Co. S. = 0

Wind E.S.E., port tack, therefore allow Leeway 2 pts.

leeway to the right.
S. 27 pts. W. = S. 25° 19' W. Var. 16° E. Dev. 4° 45' W.
Error
+ II 15 E.

Error II° 15' E.
True Co. = S. 36 34 W.

Compass Co. E. I S. = S. 71 pts. E. Wind N.N.E., port tack, therefore allow Leeway If pts. leeway to the right.

S. 51 pts. E.=S. 64° 41' E. Var. 9° 30' E. Dev. 20° W.

Error + 10 30 W. Error 10° 30'W.
True Co. = S. 75 II E.

Compass Co. W. I N. = N.7} pts. W. Wind N.N.W., Starboard tack, thereLeeway 1 pts.

fore allow leeway to the left. N. 8 pts. W., or pt. in excess of west, therefore S. 77

pts. W. = S. 81° 34' W.
S. 81° 34' W. Var. 15° 15' E. Dev. 20° 19' E.
Error + 35 34 E.

Error 35° 34' E.
S. 117 08 W.

180 00
True Co. N. 62 52 W.
For further examples see Day's Work.

Form of Deviation Table In the following “Deviation Table,” column i represents the direction of the ship's head by compass, when the Deviations of column 2 were ascertained; column 3 gives the magnetic courses.

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5 15 E.

6

o E.

5 15 E.

OE. 2 20 E.

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7 0 E. 8 15 E. 9 40 E. II 30 E. 13 30 E. 15 30 E. 17 15 E.

0 E.

N. 54

North. N. by W.

N.N.W. N.W. by N.

N.W. N.W. by W.

W.N.W. W. by N.

West. W. by S.

W.S.W. S.W. by W.

S.W. S.W. by S.

S.S.W. S. by W. South.

o W.

N. 5 15 E. North.
N. 5 15 W. N. by E.
N. 15 30 W. N.N.E.
N. 25 30 W. N.E. by N.
N. 35 20 W N.E.
N. 44 45 W. N.E. by E.

E.N.E.
N. 63 15 W. E. by N.
N. 72 45 W. East.
N. 83 15 W. E. by S.
S. 85 30 W'. E.S.E.
S. 72 55 W'. S.E. by E.

S.E.
S. 43 45 W.

S.E. by S.
S. 27 20 W S.S.E.
S. IO 15 W. S. by E.
S. 7 15 E. South.

N. 5 15 E. 4

N. 15 15 E.
N. 24 50 E.

N. 33 45 E. 3

o W. N. 42 6 40 W. N. 49 35 E. IO 40 W. N. 56 50 E. 15 o W. N. 63 45 E. 19 o W. N. 71

o E.

N. 78 45 E. 24 40 W. N. 87 50 E.

S. 81 45 E.

S. 69 40 E. 22 15 W. S. 56 0 E. 18 15 W. S. 40 45 E. 13

S. 24 15 E.

22 30 W.

18
18 0 E.
16 40 E.

14

S. 59

25 30 W.
24 40 W.

o W.

OE.
IO O E.
4 50 E.
I

o W.
7 15 W.

OW. 7 15 W.

S. 7 15 E.

EXAMPLES FOR PRACTICE.

Correct the following Compass Courses for Leeway, Variation, and Deviation of the Compagn Where the Deviation is not given, it is to be taken from the Table on p. 339.

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6. S. by E. 7. W. S. 8. W. * N. 9. w. by N. N. 10. S. by W. 11. S. by E. 12. E. by N. N. 13. N. 1 E. 14. N.W.IN 15. S.W.; W. 16. E. & S. 17. W. by S. 18. S. 1 W.

S. 23° 23' E.

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16°

E.

14°

E.

S. 85° 19' E.

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N. 61° 0' E.

S. by E. S. by W.

11

N. 64° 41' W.

W.S.W.

S. 1° 11' W.

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167°W.

121°W.
41° E.
7° W. 111°E.
111°W.

22}' E.
14°

E. 14° W.
111° E.

22° W.
194°W.
23° W.

20? W.
19° E.

27° E.
61°E.
22°W.

51° E.
10° W.

W.
29° W.
117°E.

211° E.
15°

23. E. N. 24. S. 1 E. 25. N.E. by E. 1 E.

N. 57° 45' E.

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27. East.

28. E. IN.
29. N.E. IN.
30. S. by W. 4 W.

00

.

.

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