Worksheet 17 · Skill 7
Doubling the angle on the bow
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Steering 211°T at 7.6 kn, at 1025 you see Gannet Rock daybeacon 20° on the port bow. At 1040 it is 40° on the port bow.
How far off the object are you at 1040? 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 1040: ________ nm Distance off when abeam: ________ nm
Steering 196°T at 6.7 kn, at 1620 you see Westfield church spire 25° on the starboard bow. At 1632 it is 50° on the starboard bow.
How far off the object are you at 1632? 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 1632: ________ nm Distance off when abeam: ________ nm
Steering 019°T at 5.8 kn, at 0740 you see Gannet Rock daybeacon 40° on the starboard bow. At 0802 it is 80° on the starboard bow.
How far off the object are you at 0802? 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 0802: ________ nm Distance off when abeam: ________ nm
Steering 129°T at 9.1 kn, at 1435 you see Tern Island tower 40° on the port bow. At 1453 it is 80° on the port bow.
How far off the object are you at 1453? 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 1453: ________ nm Distance off when abeam: ________ nm
Steering 118°T at 6.8 kn, at 1305 you see Tern Island tower 40° on the port bow. At 1316 it is 80° on the port bow.
How far off the object are you at 1316? 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 1316: ________ nm Distance off when abeam: ________ nm
Steering 054°T at 9.1 kn, at 0755 you see Kittle water tank 40° on the starboard bow. At 0816 it is 80° on the starboard bow.
How far off the object are you at 0816? 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 0816: ________ nm Distance off when abeam: ________ nm
Steering 023°T at 5.3 kn, at 1145 you see Tern Island tower 25° on the starboard bow. At 1212 it is 50° on the starboard bow.
How far off the object are you at 1212? 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 1212: ________ nm Distance off when abeam: ________ nm
Steering 069°T at 4.1 kn, at 1650 you see Gannet Rock daybeacon 35° on the starboard bow. At 1713 it is 70° on the starboard bow.
How far off the object are you at 1713? 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 1713: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1040: 1.90 nm Distance off when abeam: 1.22 nm | No. 17001 (worked solution) |
| 2 | Distance off at 1632: 1.34 nm Distance off when abeam: 1.03 nm | No. 17002 (worked solution) |
| 3 | Distance off at 0802: 2.13 nm Distance off when abeam: 2.09 nm | No. 17003 (worked solution) |
| 4 | Distance off at 1453: 2.73 nm Distance off when abeam: 2.69 nm | No. 17004 (worked solution) |
| 5 | Distance off at 1316: 1.25 nm Distance off when abeam: 1.23 nm | No. 17005 (worked solution) |
| 6 | Distance off at 0816: 3.19 nm Distance off when abeam: 3.14 nm | No. 17006 (worked solution) |
| 7 | Distance off at 1212: 2.39 nm Distance off when abeam: 1.83 nm | No. 17007 (worked solution) |
| 8 | Distance off at 1713: 1.57 nm Distance off when abeam: 1.48 nm | No. 17008 (worked solution) |