Worksheet 11 · Skill 7
Doubling the angle on the bow
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Steering 266°T at 9.0 kn, at 1300 you see Mill stack 25° on the port bow. At 1321 it is 50° on the port bow.
How far off the object are you at 1321? 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 1321: ________ nm Distance off when abeam: ________ nm
Steering 129°T at 9.4 kn, at 1100 you see Tern Island tower 40° on the port bow. At 1117 it is 80° on the port bow.
How far off the object are you at 1117? 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 1117: ________ nm Distance off when abeam: ________ nm
Steering 223°T at 6.1 kn, at 1025 you see Tern Island tower 35° on the starboard bow. At 1044 it is 70° on the starboard bow.
How far off the object are you at 1044? 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 1044: ________ nm Distance off when abeam: ________ nm
Steering 165°T at 7.4 kn, at 1110 you see Heron Point Light 20° on the starboard bow. At 1123 it is 40° on the starboard bow.
How far off the object are you at 1123? 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 1123: ________ nm Distance off when abeam: ________ nm
Steering 237°T at 6.1 kn, at 1740 you see Gannet Rock daybeacon 35° on the starboard bow. At 1747 it is 70° on the starboard bow.
How far off the object are you at 1747? 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 1747: ________ nm Distance off when abeam: ________ nm
Steering 290°T at 11.6 kn, at 0705 you see Heron Point Light 20° on the port bow. At 0712 it is 40° on the port bow.
How far off the object are you at 0712? 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 0712: ________ nm Distance off when abeam: ________ nm
Steering 344°T at 8.1 kn, at 1800 you see Tern Island tower 40° on the starboard bow. At 1825 it is 80° on the starboard bow.
How far off the object are you at 1825? 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 1825: ________ nm Distance off when abeam: ________ nm
Steering 343°T at 5.0 kn, at 1030 you see Gannet Rock daybeacon 35° on the port bow. At 1049 it is 70° on the port bow.
How far off the object are you at 1049? 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 1049: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1321: 3.15 nm Distance off when abeam: 2.41 nm | No. 11001 (worked solution) |
| 2 | Distance off at 1117: 2.66 nm Distance off when abeam: 2.62 nm | No. 11002 (worked solution) |
| 3 | Distance off at 1044: 1.93 nm Distance off when abeam: 1.82 nm | No. 11003 (worked solution) |
| 4 | Distance off at 1123: 1.60 nm Distance off when abeam: 1.03 nm | No. 11004 (worked solution) |
| 5 | Distance off at 1747: 0.71 nm Distance off when abeam: 0.67 nm | No. 11005 (worked solution) |
| 6 | Distance off at 0712: 1.35 nm Distance off when abeam: 0.87 nm | No. 11006 (worked solution) |
| 7 | Distance off at 1825: 3.38 nm Distance off when abeam: 3.32 nm | No. 11007 (worked solution) |
| 8 | Distance off at 1049: 1.58 nm Distance off when abeam: 1.49 nm | No. 11008 (worked solution) |