Worksheet 20 · Skill 7
Doubling the angle on the bow
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Steering 247°T at 6.9 kn, at 1625 you see Gannet Rock daybeacon 40° on the port bow. At 1639 it is 80° on the port bow.
How far off the object are you at 1639? 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 1639: ________ nm Distance off when abeam: ________ nm
Steering 123°T at 12.0 kn, at 1535 you see Kittle water tank 40° on the starboard bow. At 1547 it is 80° on the starboard bow.
How far off the object are you at 1547? 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 1547: ________ nm Distance off when abeam: ________ nm
Steering 227°T at 8.5 kn, at 1100 you see Tern Island tower 35° on the port bow. At 1110 it is 70° on the port bow.
How far off the object are you at 1110? 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 1110: ________ nm Distance off when abeam: ________ nm
Steering 166°T at 7.0 kn, at 1410 you see Westfield church spire 40° on the starboard bow. At 1426 it is 80° on the starboard bow.
How far off the object are you at 1426? 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 1426: ________ nm Distance off when abeam: ________ nm
Steering 027°T at 6.8 kn, at 0725 you see Gannet Rock daybeacon 30° on the starboard bow. At 0737 it is 60° on the starboard bow.
How far off the object are you at 0737? 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 0737: ________ nm Distance off when abeam: ________ nm
Steering 166°T at 6.0 kn, at 1210 you see Kittle water tank 20° on the starboard bow. At 1235 it is 40° on the starboard bow.
How far off the object are you at 1235? 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 1235: ________ nm Distance off when abeam: ________ nm
Steering 116°T at 6.9 kn, at 1655 you see Tern Island tower 30° on the port bow. At 1707 it is 60° on the port bow.
How far off the object are you at 1707? 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 1707: ________ nm Distance off when abeam: ________ nm
Steering 238°T at 5.2 kn, at 1615 you see Heron Point Light 35° on the port bow. At 1638 it is 70° on the port bow.
How far off the object are you at 1638? 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 1638: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1639: 1.61 nm Distance off when abeam: 1.59 nm | No. 20001 (worked solution) |
| 2 | Distance off at 1547: 2.40 nm Distance off when abeam: 2.36 nm | No. 20002 (worked solution) |
| 3 | Distance off at 1110: 1.42 nm Distance off when abeam: 1.33 nm | No. 20003 (worked solution) |
| 4 | Distance off at 1426: 1.87 nm Distance off when abeam: 1.84 nm | No. 20004 (worked solution) |
| 5 | Distance off at 0737: 1.36 nm Distance off when abeam: 1.18 nm | No. 20005 (worked solution) |
| 6 | Distance off at 1235: 2.50 nm Distance off when abeam: 1.61 nm | No. 20006 (worked solution) |
| 7 | Distance off at 1707: 1.38 nm Distance off when abeam: 1.20 nm | No. 20007 (worked solution) |
| 8 | Distance off at 1638: 1.99 nm Distance off when abeam: 1.87 nm | No. 20008 (worked solution) |