Worksheet 121 · Skill 3

Dead reckoning

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1. At 1425 you fix your position 335°T, 1.0 nm from Kittle water tank. You steer 050°T at 4.6 kn until 1440, then 319°T at 4.6 kn until 1450.

   Give the 1450 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 0855 you fix your position 268°T, 3.5 nm from Tern Island tower. You steer 163°T at 5.1 kn until 0925, then 057°T at 4.5 kn until 0935.

   Give the 0935 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  

3. At 0745 you fix your position 041°T, 2.8 nm from Tern Island tower. You steer 119°T at 7.6 kn until 0810, then 325°T at 4.8 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  

4. At 1235 you fix your position 126°T, 1.6 nm from Tern Island tower. You steer 139°T at 6.2 kn until 1250, then 284°T at 4.5 kn until 1305.

   Give the 1305 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  

5. At 0755 you fix your position 074°T, 3.2 nm from Tern Island tower. You steer 302°T at 7.3 kn until 0820, then 106°T at 4.3 kn until 0840.

   Give the 0840 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 1030 you fix your position 270°T, 3.6 nm from Tern Island tower. You steer 056°T at 5.0 kn until 1115, then 245°T at 4.1 kn until 1140.

   Give the 1140 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 1515 you fix your position 196°T, 1.4 nm from Tern Island tower. You steer 243°T at 6.6 kn until 1545, then 212°T at 5.0 kn until 1555.

   Give the 1555 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 1250 you fix your position 349°T, 2.9 nm from Mill stack. You steer 329°T at 5.3 kn until 1325, then 209°T at 6.0 kn until 1340.

   Give the 1340 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