Worksheet 569 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 133°T, 2.8 nm from Tern Island tower. You steer 336°T at 5.5 kn until 1240, then 230°T at 8.0 kn until 1255.

   Give the 1255 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 0840 you fix your position 043°T, 3.7 nm from Gannet Rock daybeacon. You steer 202°T at 5.0 kn until 0920, then 347°T at 9.6 kn until 0955.

   Give the 0955 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 0945 you fix your position 281°T, 3.4 nm from Tern Island tower. You steer 145°T at 5.0 kn until 0955, then 192°T at 5.3 kn until 1020.

   Give the 1020 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 1355 you fix your position 312°T, 2.5 nm from Tern Island tower. You steer 218°T at 4.3 kn until 1435, then 177°T at 8.1 kn until 1445.

   Give the 1445 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  

5. At 1145 you fix your position 298°T, 2.1 nm from Kittle water tank. You steer 298°T at 4.6 kn until 1220, then 258°T at 7.6 kn until 1245.

   Give the 1245 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  

6. At 1210 you fix your position 272°T, 1.7 nm from Gannet Rock daybeacon. You steer 228°T at 7.8 kn until 1225, then 055°T at 6.4 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  

7. At 0710 you fix your position 061°T, 2.2 nm from Tern Island tower. You steer 033°T at 4.7 kn until 0730, then 143°T at 6.2 kn until 0745.

   Give the 0745 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 0945 you fix your position 071°T, 2.7 nm from Gannet Rock daybeacon. You steer 184°T at 4.2 kn until 1015, then 298°T at 9.0 kn until 1030.

   Give the 1030 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