Worksheet 738 · Skill 3

Dead reckoning

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1. At 1105 you fix your position 274°T, 2.9 nm from Tern Island tower. You steer 160°T at 8.2 kn until 1115, then 234°T at 9.4 kn until 1135.

   Give the 1135 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  

2. At 1540 you fix your position 015°T, 2.4 nm from Mill stack. You steer 343°T at 8.3 kn until 1625, then 250°T at 9.5 kn until 1640.

   Give the 1640 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  

3. At 0850 you fix your position 014°T, 1.4 nm from Heron Point Light. You steer 215°T at 4.0 kn until 0900, then 011°T at 4.3 kn until 0915.

   Give the 0915 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 1545 you fix your position 320°T, 2.9 nm from Tern Island tower. You steer 143°T at 9.3 kn until 1555, then 256°T at 5.0 kn until 1610.

   Give the 1610 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  

5. At 0705 you fix your position 031°T, 3.7 nm from Heron Point Light. You steer 357°T at 9.8 kn until 0720, then 054°T at 4.2 kn until 0730.

   Give the 0730 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 325°T, 1.1 nm from Kittle water tank. You steer 062°T at 4.1 kn until 1045, then 325°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  

7. At 1020 you fix your position 277°T, 2.2 nm from Gannet Rock daybeacon. You steer 176°T at 5.6 kn until 1045, then 012°T at 4.1 kn until 1130.

   Give the 1130 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 0855 you fix your position 084°T, 2.4 nm from Gannet Rock daybeacon. You steer 245°T at 8.7 kn until 0920, then 306°T at 4.3 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