Worksheet 2 · Skill 7
Doubling the angle on the bow
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Steering 059°T at 10.2 kn, at 1030 you see Gannet Rock daybeacon 25° on the starboard bow. At 1039 it is 50° on the starboard bow.
How far off the object are you at 1039? 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 1039: ________ nm Distance off when abeam: ________ nm
Steering 289°T at 9.2 kn, at 1520 you see Heron Point Light 25° on the port bow. At 1530 it is 50° on the port bow.
How far off the object are you at 1530? 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 1530: ________ nm Distance off when abeam: ________ nm
Steering 137°T at 4.0 kn, at 1625 you see Tern Island tower 40° on the port bow. At 1653 it is 80° on the port bow.
How far off the object are you at 1653? 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 1653: ________ nm Distance off when abeam: ________ nm
Steering 285°T at 10.4 kn, at 1735 you see Westfield church spire 20° on the port bow. At 1745 it is 40° on the port bow.
How far off the object are you at 1745? 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 1745: ________ nm Distance off when abeam: ________ nm
Steering 180°T at 5.0 kn, at 0955 you see Heron Point Light 25° on the starboard bow. At 1012 it is 50° on the starboard bow.
How far off the object are you at 1012? 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 1012: ________ nm Distance off when abeam: ________ nm
Steering 212°T at 5.1 kn, at 0945 you see Gannet Rock daybeacon 40° on the starboard bow. At 0953 it is 80° on the starboard bow.
How far off the object are you at 0953? 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 0953: ________ nm Distance off when abeam: ________ nm
Steering 267°T at 11.5 kn, at 1245 you see Mill stack 20° on the port bow. At 1253 it is 40° on the port bow.
How far off the object are you at 1253? 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 1253: ________ nm Distance off when abeam: ________ nm
Steering 155°T at 6.4 kn, at 0855 you see Gannet Rock daybeacon 25° on the port bow. At 0919 it is 50° on the port bow.
How far off the object are you at 0919? 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 0919: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1039: 1.53 nm Distance off when abeam: 1.17 nm | No. 2001 (worked solution) |
| 2 | Distance off at 1530: 1.53 nm Distance off when abeam: 1.17 nm | No. 2002 (worked solution) |
| 3 | Distance off at 1653: 1.87 nm Distance off when abeam: 1.84 nm | No. 2003 (worked solution) |
| 4 | Distance off at 1745: 1.73 nm Distance off when abeam: 1.11 nm | No. 2004 (worked solution) |
| 5 | Distance off at 1012: 1.42 nm Distance off when abeam: 1.09 nm | No. 2005 (worked solution) |
| 6 | Distance off at 0953: 0.68 nm Distance off when abeam: 0.67 nm | No. 2006 (worked solution) |
| 7 | Distance off at 1253: 1.53 nm Distance off when abeam: 0.99 nm | No. 2007 (worked solution) |
| 8 | Distance off at 0919: 2.56 nm Distance off when abeam: 1.96 nm | No. 2008 (worked solution) |