Worksheet 377 · Skill 3

Dead reckoning

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1. At 1155 you fix your position 037°T, 2.6 nm from Tern Island tower. You steer 195°T at 5.4 kn until 1210, then 114°T at 5.2 kn until 1245.

   Give the 1245 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

2. At 0925 you fix your position 087°T, 2.0 nm from Gannet Rock daybeacon. You steer 105°T at 7.4 kn until 0935, then 322°T at 6.1 kn until 0950.

   Give the 0950 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

3. At 0735 you fix your position 074°T, 3.7 nm from Tern Island tower. You steer 221°T at 4.8 kn until 0800, then 065°T at 4.7 kn until 0825.

   Give the 0825 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

4. At 1510 you fix your position 259°T, 3.4 nm from Tern Island tower. You steer 060°T at 7.4 kn until 1520, then 128°T at 9.5 kn until 1550.

   Give the 1550 DR position as the true bearing FROM Kittle water tank to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Kittle water tank: ________ °T   Distance: ________ nm  

5. At 1345 you fix your position 136°T, 0.9 nm from Gannet Rock daybeacon. You steer 188°T at 4.5 kn until 1405, then 258°T at 5.0 kn until 1445.

   Give the 1445 DR position as the true bearing FROM Mill stack to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Mill stack: ________ °T   Distance: ________ nm  

6. At 1030 you fix your position 060°T, 3.2 nm from Heron Point Light. You steer 124°T at 4.0 kn until 1050, then 027°T at 6.2 kn until 1110.

   Give the 1110 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

7. At 1205 you fix your position 071°T, 1.8 nm from Westfield church spire. You steer 116°T at 8.1 kn until 1230, then 289°T at 4.2 kn until 1240.

   Give the 1240 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm  

8. At 0930 you fix your position 079°T, 2.3 nm from Gannet Rock daybeacon. You steer 324°T at 7.9 kn until 0940, then 199°T at 6.5 kn until 1015.

   Give the 1015 DR position as the true bearing FROM Kittle water tank to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Kittle water tank: ________ °T   Distance: ________ nm