Worksheet 23 · Skill 7
Doubling the angle on the bow
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Steering 213°T at 4.8 kn, at 0920 you see Gannet Rock daybeacon 30° on the starboard bow. At 0933 it is 60° on the starboard bow.
How far off the object are you at 0933? 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 0933: ________ nm Distance off when abeam: ________ nm
Steering 097°T at 9.3 kn, at 1200 you see Tern Island tower 40° on the port bow. At 1210 it is 80° on the port bow.
How far off the object are you at 1210? 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 1210: ________ nm Distance off when abeam: ________ nm
Steering 013°T at 5.9 kn, at 1135 you see Gannet Rock daybeacon 20° on the port bow. At 1147 it is 40° on the port bow.
How far off the object are you at 1147? 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 1147: ________ nm Distance off when abeam: ________ nm
Steering 145°T at 9.7 kn, at 1420 you see Mill stack 30° on the starboard bow. At 1437 it is 60° on the starboard bow.
How far off the object are you at 1437? 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 1437: ________ nm Distance off when abeam: ________ nm
Steering 283°T at 6.3 kn, at 1205 you see Tern Island tower 25° on the port bow. At 1222 it is 50° on the port bow.
How far off the object are you at 1222? 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 1222: ________ nm Distance off when abeam: ________ nm
Steering 206°T at 8.2 kn, at 0845 you see Tern Island tower 30° on the starboard bow. At 0902 it is 60° on the starboard bow.
How far off the object are you at 0902? 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 0902: ________ nm Distance off when abeam: ________ nm
Steering 120°T at 11.1 kn, at 1415 you see Mill stack 30° on the starboard bow. At 1425 it is 60° on the starboard bow.
How far off the object are you at 1425? 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 1425: ________ nm Distance off when abeam: ________ nm
Steering 211°T at 6.4 kn, at 1020 you see Gannet Rock daybeacon 20° on the port bow. At 1027 it is 40° on the port bow.
How far off the object are you at 1027? 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 1027: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 0933: 1.04 nm Distance off when abeam: 0.90 nm | No. 23001 (worked solution) |
| 2 | Distance off at 1210: 1.55 nm Distance off when abeam: 1.53 nm | No. 23002 (worked solution) |
| 3 | Distance off at 1147: 1.18 nm Distance off when abeam: 0.76 nm | No. 23003 (worked solution) |
| 4 | Distance off at 1437: 2.75 nm Distance off when abeam: 2.38 nm | No. 23004 (worked solution) |
| 5 | Distance off at 1222: 1.79 nm Distance off when abeam: 1.37 nm | No. 23005 (worked solution) |
| 6 | Distance off at 0902: 2.32 nm Distance off when abeam: 2.01 nm | No. 23006 (worked solution) |
| 7 | Distance off at 1425: 1.85 nm Distance off when abeam: 1.60 nm | No. 23007 (worked solution) |
| 8 | Distance off at 1027: 0.75 nm Distance off when abeam: 0.48 nm | No. 23008 (worked solution) |