Worksheet 18 · Skill 7
Doubling the angle on the bow
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Steering 154°T at 5.6 kn, at 0755 you see Heron Point Light 25° on the starboard bow. At 0825 it is 50° on the starboard bow.
How far off the object are you at 0825? 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 0825: ________ nm Distance off when abeam: ________ nm
Steering 354°T at 4.9 kn, at 1445 you see Gannet Rock daybeacon 25° on the starboard bow. At 1455 it is 50° on the starboard bow.
How far off the object are you at 1455? 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 1455: ________ nm Distance off when abeam: ________ nm
Steering 035°T at 10.1 kn, at 0810 you see Tern Island tower 35° on the starboard bow. At 0825 it is 70° on the starboard bow.
How far off the object are you at 0825? 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 0825: ________ nm Distance off when abeam: ________ nm
Steering 109°T at 4.9 kn, at 0855 you see Gannet Rock daybeacon 40° on the starboard bow. At 0902 it is 80° 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 159°T at 11.1 kn, at 1600 you see Tern Island tower 30° on the port bow. At 1610 it is 60° on the port bow.
How far off the object are you at 1610? 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 1610: ________ nm Distance off when abeam: ________ nm
Steering 011°T at 9.5 kn, at 1715 you see Tern Island tower 25° on the starboard bow. At 1725 it is 50° on the starboard bow.
How far off the object are you at 1725? 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 1725: ________ nm Distance off when abeam: ________ nm
Steering 075°T at 5.0 kn, at 1400 you see Tern Island tower 30° on the port bow. At 1424 it is 60° on the port bow.
How far off the object are you at 1424? 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 1424: ________ nm Distance off when abeam: ________ nm
Steering 097°T at 8.3 kn, at 1255 you see Gannet Rock daybeacon 25° on the port bow. At 1300 it is 50° on the port bow.
How far off the object are you at 1300? 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 1300: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 0825: 2.80 nm Distance off when abeam: 2.14 nm | No. 18001 (worked solution) |
| 2 | Distance off at 1455: 0.82 nm Distance off when abeam: 0.63 nm | No. 18002 (worked solution) |
| 3 | Distance off at 0825: 2.53 nm Distance off when abeam: 2.37 nm | No. 18003 (worked solution) |
| 4 | Distance off at 0902: 0.57 nm Distance off when abeam: 0.56 nm | No. 18004 (worked solution) |
| 5 | Distance off at 1610: 1.85 nm Distance off when abeam: 1.60 nm | No. 18005 (worked solution) |
| 6 | Distance off at 1725: 1.58 nm Distance off when abeam: 1.21 nm | No. 18006 (worked solution) |
| 7 | Distance off at 1424: 2.00 nm Distance off when abeam: 1.73 nm | No. 18007 (worked solution) |
| 8 | Distance off at 1300: 0.69 nm Distance off when abeam: 0.53 nm | No. 18008 (worked solution) |