Worksheet 25 · Skill 7
Doubling the angle on the bow
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Steering 204°T at 4.8 kn, at 1000 you see Tern Island tower 40° on the port bow. At 1018 it is 80° on the port bow.
How far off the object are you at 1018? 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 1018: ________ nm Distance off when abeam: ________ nm
Steering 214°T at 5.9 kn, at 1640 you see Westfield church spire 40° on the starboard bow. At 1706 it is 80° on the starboard bow.
How far off the object are you at 1706? 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 1706: ________ nm Distance off when abeam: ________ nm
Steering 143°T at 11.3 kn, at 1350 you see Kittle water tank 20° on the starboard bow. At 1401 it is 40° on the starboard bow.
How far off the object are you at 1401? 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 1401: ________ nm Distance off when abeam: ________ nm
Steering 099°T at 5.9 kn, at 0935 you see Gannet Rock daybeacon 20° on the port bow. At 0954 it is 40° on the port bow.
How far off the object are you at 0954? 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 0954: ________ nm Distance off when abeam: ________ nm
Steering 282°T at 6.3 kn, at 0925 you see Gannet Rock daybeacon 20° on the port bow. At 0934 it is 40° on the port bow.
How far off the object are you at 0934? 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 0934: ________ nm Distance off when abeam: ________ nm
Steering 023°T at 4.9 kn, at 0845 you see Tern Island tower 25° on the port bow. At 0907 it is 50° on the port bow.
How far off the object are you at 0907? 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 0907: ________ nm Distance off when abeam: ________ nm
Steering 070°T at 5.8 kn, at 1025 you see Tern Island tower 40° on the starboard bow. At 1046 it is 80° on the starboard bow.
How far off the object are you at 1046? 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 1046: ________ nm Distance off when abeam: ________ nm
Steering 262°T at 8.4 kn, at 1045 you see Gannet Rock daybeacon 35° on the port bow. At 1103 it is 70° on the port bow.
How far off the object are you at 1103? 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 1103: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1018: 1.44 nm Distance off when abeam: 1.42 nm | No. 25001 (worked solution) |
| 2 | Distance off at 1706: 2.56 nm Distance off when abeam: 2.52 nm | No. 25002 (worked solution) |
| 3 | Distance off at 1401: 2.07 nm Distance off when abeam: 1.33 nm | No. 25003 (worked solution) |
| 4 | Distance off at 0954: 1.87 nm Distance off when abeam: 1.20 nm | No. 25004 (worked solution) |
| 5 | Distance off at 0934: 0.95 nm Distance off when abeam: 0.61 nm | No. 25005 (worked solution) |
| 6 | Distance off at 0907: 1.80 nm Distance off when abeam: 1.38 nm | No. 25006 (worked solution) |
| 7 | Distance off at 1046: 2.03 nm Distance off when abeam: 2.00 nm | No. 25007 (worked solution) |
| 8 | Distance off at 1103: 2.52 nm Distance off when abeam: 2.37 nm | No. 25008 (worked solution) |