Worksheet 15 · Skill 7
Doubling the angle on the bow
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Steering 160°T at 7.2 kn, at 1225 you see Gannet Rock daybeacon 40° on the port bow. At 1242 it is 80° on the port bow.
How far off the object are you at 1242? 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 1242: ________ nm Distance off when abeam: ________ nm
Steering 087°T at 6.0 kn, at 1050 you see Kittle water tank 40° on the starboard bow. At 1104 it is 80° on the starboard bow.
How far off the object are you at 1104? 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 1104: ________ nm Distance off when abeam: ________ nm
Steering 343°T at 6.4 kn, at 1755 you see Tern Island tower 25° on the port bow. At 1820 it is 50° on the port bow.
How far off the object are you at 1820? 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 1820: ________ nm Distance off when abeam: ________ nm
Steering 075°T at 5.6 kn, at 1420 you see Tern Island tower 40° on the port bow. At 1447 it is 80° on the port bow.
How far off the object are you at 1447? 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 1447: ________ nm Distance off when abeam: ________ nm
Steering 145°T at 5.7 kn, at 1010 you see Westfield church spire 40° on the starboard bow. At 1022 it is 80° on the starboard bow.
How far off the object are you at 1022? 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 1022: ________ nm Distance off when abeam: ________ nm
Steering 273°T at 7.5 kn, at 1100 you see Heron Point Light 20° on the port bow. At 1121 it is 40° on the port bow.
How far off the object are you at 1121? 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 1121: ________ nm Distance off when abeam: ________ nm
Steering 314°T at 4.6 kn, at 1620 you see Heron Point Light 30° on the port bow. At 1643 it is 60° on the port bow.
How far off the object are you at 1643? 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 1643: ________ nm Distance off when abeam: ________ nm
Steering 110°T at 8.5 kn, at 1605 you see Mill stack 25° on the starboard bow. At 1629 it is 50° on the starboard bow.
How far off the object are you at 1629? 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 1629: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1242: 2.04 nm Distance off when abeam: 2.01 nm | No. 15001 (worked solution) |
| 2 | Distance off at 1104: 1.40 nm Distance off when abeam: 1.38 nm | No. 15002 (worked solution) |
| 3 | Distance off at 1820: 2.67 nm Distance off when abeam: 2.04 nm | No. 15003 (worked solution) |
| 4 | Distance off at 1447: 2.52 nm Distance off when abeam: 2.48 nm | No. 15004 (worked solution) |
| 5 | Distance off at 1022: 1.14 nm Distance off when abeam: 1.12 nm | No. 15005 (worked solution) |
| 6 | Distance off at 1121: 2.63 nm Distance off when abeam: 1.69 nm | No. 15006 (worked solution) |
| 7 | Distance off at 1643: 1.76 nm Distance off when abeam: 1.53 nm | No. 15007 (worked solution) |
| 8 | Distance off at 1629: 3.40 nm Distance off when abeam: 2.60 nm | No. 15008 (worked solution) |