Worksheet 10 · Skill 7
Doubling the angle on the bow
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Steering 104°T at 5.7 kn, at 0930 you see Gannet Rock daybeacon 30° on the port bow. At 0958 it is 60° on the port bow.
How far off the object are you at 0958? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 0958: ________ nm Distance off when abeam: ________ nm
Steering 205°T at 7.0 kn, at 1155 you see Westfield church spire 30° on the starboard bow. At 1212 it is 60° on the starboard bow.
How far off the object are you at 1212? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 1212: ________ nm Distance off when abeam: ________ nm
Steering 053°T at 10.4 kn, at 0855 you see Tern Island tower 30° on the starboard bow. At 0915 it is 60° on the starboard bow.
How far off the object are you at 0915? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 0915: ________ nm Distance off when abeam: ________ nm
Steering 143°T at 10.8 kn, at 0750 you see Tern Island tower 25° on the port bow. At 0803 it is 50° on the port bow.
How far off the object are you at 0803? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 0803: ________ nm Distance off when abeam: ________ nm
Steering 126°T at 8.5 kn, at 0955 you see Tern Island tower 40° on the port bow. At 1010 it is 80° on the port bow.
How far off the object are you at 1010? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 1010: ________ nm Distance off when abeam: ________ nm
Steering 181°T at 7.0 kn, at 1310 you see Heron Point Light 20° on the starboard bow. At 1330 it is 40° on the starboard bow.
How far off the object are you at 1330? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 1330: ________ nm Distance off when abeam: ________ nm
Steering 348°T at 11.8 kn, at 1605 you see Tern Island tower 35° on the starboard bow. At 1613 it is 70° on the starboard bow.
How far off the object are you at 1613? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 1613: ________ nm Distance off when abeam: ________ nm
Steering 081°T at 4.8 kn, at 1455 you see Gannet Rock daybeacon 40° on the port bow. At 1508 it is 80° on the port bow.
How far off the object are you at 1508? If you hold your course and there is no current, how far off will you pass when it is abeam?
Tolerance: 0.05 nm.
Distance off at 1508: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 0958: 2.66 nm Distance off when abeam: 2.30 nm | No. 10001 (worked solution) |
| 2 | Distance off at 1212: 1.98 nm Distance off when abeam: 1.72 nm | No. 10002 (worked solution) |
| 3 | Distance off at 0915: 3.47 nm Distance off when abeam: 3.00 nm | No. 10003 (worked solution) |
| 4 | Distance off at 0803: 2.34 nm Distance off when abeam: 1.79 nm | No. 10004 (worked solution) |
| 5 | Distance off at 1010: 2.13 nm Distance off when abeam: 2.09 nm | No. 10005 (worked solution) |
| 6 | Distance off at 1330: 2.33 nm Distance off when abeam: 1.50 nm | No. 10006 (worked solution) |
| 7 | Distance off at 1613: 1.57 nm Distance off when abeam: 1.48 nm | No. 10007 (worked solution) |
| 8 | Distance off at 1508: 1.04 nm Distance off when abeam: 1.02 nm | No. 10008 (worked solution) |