Worksheet 27 · Skill 7
Doubling the angle on the bow
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Steering 084°T at 9.6 kn, at 1100 you see Tern Island tower 40° on the port bow. At 1121 it is 80° 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 222°T at 7.6 kn, at 1055 you see Westfield church spire 25° on the starboard bow. At 1111 it is 50° on the starboard bow.
How far off the object are you at 1111? 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 1111: ________ nm Distance off when abeam: ________ nm
Steering 230°T at 5.6 kn, at 1735 you see Tern Island tower 30° on the starboard bow. At 1759 it is 60° on the starboard bow.
How far off the object are you at 1759? 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 1759: ________ nm Distance off when abeam: ________ nm
Steering 041°T at 4.0 kn, at 1350 you see Gannet Rock daybeacon 30° on the starboard bow. At 1359 it is 60° on the starboard bow.
How far off the object are you at 1359? 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 1359: ________ nm Distance off when abeam: ________ nm
Steering 057°T at 8.9 kn, at 1200 you see Tern Island tower 25° on the port bow. At 1222 it is 50° on the port bow.
How far off the object are you at 1222? 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 1222: ________ nm Distance off when abeam: ________ nm
Steering 059°T at 5.4 kn, at 0820 you see Gannet Rock daybeacon 40° on the port bow. At 0840 it is 80° on the port bow.
How far off the object are you at 0840? 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 0840: ________ nm Distance off when abeam: ________ nm
Steering 236°T at 5.8 kn, at 1300 you see Mill stack 25° on the port bow. At 1327 it is 50° on the port bow.
How far off the object are you at 1327? 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 1327: ________ nm Distance off when abeam: ________ nm
Steering 035°T at 6.0 kn, at 1510 you see Gannet Rock daybeacon 40° on the port bow. At 1522 it is 80° on the port bow.
How far off the object are you at 1522? 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 1522: ________ nm Distance off when abeam: ________ nm
Practice Sheet No. 1
Answer key
| No. | Answers | Problem |
|---|---|---|
| 1 | Distance off at 1121: 3.36 nm Distance off when abeam: 3.31 nm | No. 27001 (worked solution) |
| 2 | Distance off at 1111: 2.03 nm Distance off when abeam: 1.55 nm | No. 27002 (worked solution) |
| 3 | Distance off at 1759: 2.24 nm Distance off when abeam: 1.94 nm | No. 27003 (worked solution) |
| 4 | Distance off at 1359: 0.60 nm Distance off when abeam: 0.52 nm | No. 27004 (worked solution) |
| 5 | Distance off at 1222: 3.26 nm Distance off when abeam: 2.50 nm | No. 27005 (worked solution) |
| 6 | Distance off at 0840: 1.80 nm Distance off when abeam: 1.77 nm | No. 27006 (worked solution) |
| 7 | Distance off at 1327: 2.61 nm Distance off when abeam: 2.00 nm | No. 27007 (worked solution) |
| 8 | Distance off at 1522: 1.20 nm Distance off when abeam: 1.18 nm | No. 27008 (worked solution) |