Worksheet 18 · Skill 3

Dead reckoning

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1. At 1540 you fix your position 134°T, 3.1 nm from Tern Island tower. You steer 016°T at 5.2 kn until 1600, then 192°T at 5.0 kn until 1640.

   Give the 1640 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 1600 you fix your position 072°T, 1.8 nm from Westfield church spire. You steer 142°T at 9.5 kn until 1620, then 078°T at 8.2 kn until 1630.

   Give the 1630 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  

3. At 1005 you fix your position 025°T, 1.6 nm from Heron Point Light. You steer 121°T at 5.0 kn until 1045, then 333°T at 5.9 kn until 1115.

   Give the 1115 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  

4. At 0850 you fix your position 063°T, 2.6 nm from Westfield church spire. You steer 072°T at 7.9 kn until 0920, then 248°T at 9.1 kn until 0930.

   Give the 0930 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  

5. At 1255 you fix your position 252°T, 2.5 nm from Tern Island tower. You steer 122°T at 4.8 kn until 1305, then 324°T at 5.8 kn until 1315.

   Give the 1315 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  

6. At 1320 you fix your position 351°T, 1.2 nm from Heron Point Light. You steer 116°T at 9.9 kn until 1335, then 328°T at 6.9 kn until 1345.

   Give the 1345 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  

7. At 1150 you fix your position 041°T, 4.6 nm from Westfield church spire. You steer 144°T at 4.5 kn until 1210, then 086°T at 4.5 kn until 1245.

   Give the 1245 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  

8. At 1235 you fix your position 042°T, 3.1 nm from Westfield church spire. You steer 201°T at 6.8 kn until 1250, then 077°T at 5.1 kn until 1320.

   Give the 1320 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