Worksheet 600 · Skill 3

Dead reckoning

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1. At 1510 you fix your position 003°T, 1.7 nm from Gannet Rock daybeacon. You steer 240°T at 9.8 kn until 1530, then 137°T at 5.1 kn until 1540.

   Give the 1540 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 1400 you fix your position 267°T, 3.2 nm from Tern Island tower. You steer 144°T at 5.4 kn until 1440, then 229°T at 4.4 kn until 1520.

   Give the 1520 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 0840 you fix your position 020°T, 2.6 nm from Heron Point Light. You steer 317°T at 8.4 kn until 0900, then 153°T at 6.4 kn until 0935.

   Give the 0935 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 1415 you fix your position 237°T, 1.9 nm from Tern Island tower. You steer 313°T at 6.0 kn until 1500, then 150°T at 7.7 kn until 1545.

   Give the 1545 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  

5. At 0840 you fix your position 080°T, 3.0 nm from Gannet Rock daybeacon. You steer 312°T at 8.5 kn until 0910, then 121°T at 4.6 kn until 0925.

   Give the 0925 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 1435 you fix your position 259°T, 3.1 nm from Tern Island tower. You steer 012°T at 5.6 kn until 1505, then 267°T at 5.8 kn until 1540.

   Give the 1540 DR position as the true bearing FROM Westfield church spire 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 Westfield church spire: ________ °T   Distance: ________ nm  

7. At 1205 you fix your position 199°T, 2.5 nm from Tern Island tower. You steer 333°T at 6.5 kn until 1220, then 116°T at 5.6 kn until 1255.

   Give the 1255 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 0735 you fix your position 235°T, 3.2 nm from Tern Island tower. You steer 318°T at 4.8 kn until 0755, then 126°T at 4.0 kn until 0820.

   Give the 0820 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