Add an explanation of the Deviation Card in Bowditch, page 41.
Put in your Note-Book:
Entering New York Harbor, ship heading W ¾ N, Variation 9° W. Observed by pelorus the following objects:
Buoy No. 1 - ENE ¼ E
" " 2 - E ½ N
" " 3 - NE ¼ E
" " 4 - NW ¼ N
Required true bearings of objects observed.
Answer:
From Deviation Card in Bowditch, p. 41, Deviation on W ¾ N course is 5° E. Hence, Compass Error is 5° E (Dev.) + 9° W (Var.) = 4° W.
| C. B. | C. E. | T. B. | |
| ENE ¼ E | 70° | 4° W | 66° |
| E ½ N | 84° | 4° W | 80° |
| NE ¼ E | 48° | 4° W | 44° |
| NW ¼ N | 318° | 4° W | 314° |