Worksheet 12 · Skill 7
Doubling the angle on the bow
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Steering 266°T at 10.8 kn, at 1425 you see Westfield church spire 35° on the starboard bow. At 1430 it is 70° on the starboard bow.
How far off the object are you at 1430? 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 1430: ________ nm Distance off when abeam: ________ nm
Steering 234°T at 6.1 kn, at 0730 you see Tern Island tower 40° on the starboard bow. At 0743 it is 80° on the starboard bow.
How far off the object are you at 0743? 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 0743: ________ nm Distance off when abeam: ________ nm
Steering 318°T at 6.4 kn, at 1330 you see Gannet Rock daybeacon 40° on the starboard bow. At 1336 it is 80° on the starboard bow.
How far off the object are you at 1336? 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 1336: ________ nm Distance off when abeam: ________ nm
Steering 173°T at 8.0 kn, at 1400 you see Heron Point Light 20° on the starboard bow. At 1424 it is 40° on the starboard 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 250°T at 6.2 kn, at 1000 you see Mill stack 20° on the port bow. At 1025 it is 40° on the port bow.
How far off the object are you at 1025? 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 1025: ________ nm Distance off when abeam: ________ nm
Steering 064°T at 7.7 kn, at 1300 you see Tern Island tower 30° on the port bow. At 1317 it is 60° on the port bow.
How far off the object are you at 1317? 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 1317: ________ nm Distance off when abeam: ________ nm
Steering 301°T at 10.8 kn, at 0835 you see Gannet Rock daybeacon 20° on the starboard bow. At 0841 it is 40° on the starboard bow.
How far off the object are you at 0841? 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 0841: ________ nm Distance off when abeam: ________ nm
Steering 120°T at 6.4 kn, at 1730 you see Kittle water tank 25° on the starboard bow. At 1740 it is 50° on the starboard bow.
How far off the object are you at 1740? 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 1740: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1430: 0.90 nm Distance off when abeam: 0.85 nm | No. 12001 (worked solution) |
| 2 | Distance off at 0743: 1.32 nm Distance off when abeam: 1.30 nm | No. 12002 (worked solution) |
| 3 | Distance off at 1336: 0.64 nm Distance off when abeam: 0.63 nm | No. 12003 (worked solution) |
| 4 | Distance off at 1424: 3.20 nm Distance off when abeam: 2.06 nm | No. 12004 (worked solution) |
| 5 | Distance off at 1025: 2.58 nm Distance off when abeam: 1.66 nm | No. 12005 (worked solution) |
| 6 | Distance off at 1317: 2.18 nm Distance off when abeam: 1.89 nm | No. 12006 (worked solution) |
| 7 | Distance off at 0841: 1.08 nm Distance off when abeam: 0.69 nm | No. 12007 (worked solution) |
| 8 | Distance off at 1740: 1.07 nm Distance off when abeam: 0.82 nm | No. 12008 (worked solution) |