Worksheet 5 · Skill 7
Doubling the angle on the bow
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Steering 069°T at 5.5 kn, at 1115 you see Tern Island tower 40° on the starboard bow. At 1129 it is 80° on the starboard bow.
How far off the object are you at 1129? 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 1129: ________ nm Distance off when abeam: ________ nm
Steering 146°T at 5.1 kn, at 0740 you see Heron Point Light 40° on the starboard bow. At 0806 it is 80° on the starboard bow.
How far off the object are you at 0806? 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 0806: ________ nm Distance off when abeam: ________ nm
Steering 081°T at 7.4 kn, at 1700 you see Gannet Rock daybeacon 25° on the starboard bow. At 1717 it is 50° on the starboard bow.
How far off the object are you at 1717? 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 1717: ________ nm Distance off when abeam: ________ nm
Steering 329°T at 6.7 kn, at 1230 you see Gannet Rock daybeacon 30° on the port bow. At 1236 it is 60° on the port bow.
How far off the object are you at 1236? 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 1236: ________ nm Distance off when abeam: ________ nm
Steering 261°T at 10.4 kn, at 1635 you see Westfield church spire 30° on the starboard bow. At 1646 it is 60° on the starboard bow.
How far off the object are you at 1646? 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 1646: ________ nm Distance off when abeam: ________ nm
Steering 044°T at 6.1 kn, at 1625 you see Gannet Rock daybeacon 30° on the starboard bow. At 1636 it is 60° on the starboard bow.
How far off the object are you at 1636? 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 1636: ________ nm Distance off when abeam: ________ nm
Steering 095°T at 9.3 kn, at 1545 you see Gannet Rock daybeacon 25° on the port bow. At 1602 it is 50° on the port bow.
How far off the object are you at 1602? 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 1602: ________ nm Distance off when abeam: ________ nm
Steering 226°T at 4.8 kn, at 1245 you see Tern Island tower 35° on the starboard bow. At 1313 it is 70° on the starboard bow.
How far off the object are you at 1313? 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 1313: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1129: 1.28 nm Distance off when abeam: 1.26 nm | No. 5001 (worked solution) |
| 2 | Distance off at 0806: 2.21 nm Distance off when abeam: 2.18 nm | No. 5002 (worked solution) |
| 3 | Distance off at 1717: 2.10 nm Distance off when abeam: 1.61 nm | No. 5003 (worked solution) |
| 4 | Distance off at 1236: 0.67 nm Distance off when abeam: 0.58 nm | No. 5004 (worked solution) |
| 5 | Distance off at 1646: 1.91 nm Distance off when abeam: 1.65 nm | No. 5005 (worked solution) |
| 6 | Distance off at 1636: 1.12 nm Distance off when abeam: 0.97 nm | No. 5006 (worked solution) |
| 7 | Distance off at 1602: 2.64 nm Distance off when abeam: 2.02 nm | No. 5007 (worked solution) |
| 8 | Distance off at 1313: 2.24 nm Distance off when abeam: 2.10 nm | No. 5008 (worked solution) |