Worksheet 474 · Skill 3

Dead reckoning

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1. At 1055 you fix your position 296°T, 4.0 nm from Tern Island tower. You steer 356°T at 4.2 kn until 1105, then 176°T at 4.6 kn until 1120.

   Give the 1120 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 1355 you fix your position 063°T, 3.0 nm from Gannet Rock daybeacon. You steer 012°T at 8.0 kn until 1410, then 277°T at 8.7 kn until 1440.

   Give the 1440 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 0855 you fix your position 043°T, 4.5 nm from Westfield church spire. You steer 100°T at 5.7 kn until 0925, then 195°T at 6.1 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  

4. At 0915 you fix your position 159°T, 1.2 nm from Tern Island tower. You steer 254°T at 5.0 kn until 0925, then 160°T at 9.3 kn until 0945.

   Give the 0945 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 0820 you fix your position 215°T, 2.2 nm from Gannet Rock daybeacon. You steer 058°T at 4.1 kn until 0830, then 260°T at 9.8 kn until 0840.

   Give the 0840 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  

6. At 1040 you fix your position 102°T, 2.4 nm from Westfield church spire. You steer 096°T at 7.9 kn until 1105, then 246°T at 8.3 kn until 1120.

   Give the 1120 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 1445 you fix your position 212°T, 2.1 nm from Tern Island tower. You steer 132°T at 8.9 kn until 1515, then 335°T at 8.8 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  

8. At 1130 you fix your position 251°T, 2.0 nm from Gannet Rock daybeacon. You steer 098°T at 6.0 kn until 1155, then 179°T at 7.6 kn until 1205.

   Give the 1205 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