Worksheet 439 · Skill 3

Dead reckoning

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1. At 0835 you fix your position 043°T, 2.5 nm from Mill stack. You steer 000°T at 5.8 kn until 0905, then 246°T at 5.9 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  

2. At 0830 you fix your position 072°T, 1.5 nm from Gannet Rock daybeacon. You steer 304°T at 5.2 kn until 0840, then 346°T at 5.2 kn until 0910.

   Give the 0910 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 1520 you fix your position 299°T, 1.0 nm from Gannet Rock daybeacon. You steer 257°T at 8.3 kn until 1550, then 023°T at 7.4 kn until 1615.

   Give the 1615 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 0730 you fix your position 063°T, 2.6 nm from Gannet Rock daybeacon. You steer 216°T at 6.7 kn until 0810, then 066°T at 6.7 kn until 0820.

   Give the 0820 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 0930 you fix your position 024°T, 1.3 nm from Tern Island tower. You steer 091°T at 9.2 kn until 0955, then 156°T at 4.2 kn until 1020.

   Give the 1020 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  

6. At 0730 you fix your position 326°T, 1.4 nm from Gannet Rock daybeacon. You steer 061°T at 6.9 kn until 0810, then 180°T at 7.3 kn until 0820.

   Give the 0820 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  

7. At 1210 you fix your position 073°T, 3.4 nm from Tern Island tower. You steer 224°T at 8.7 kn until 1240, then 039°T at 7.1 kn until 1305.

   Give the 1305 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 1015 you fix your position 051°T, 1.8 nm from Kittle water tank. You steer 297°T at 4.5 kn until 1045, then 226°T at 5.7 kn until 1110.

   Give the 1110 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