Worksheet 570 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 206°T, 1.7 nm from Tern Island tower. You steer 190°T at 7.2 kn until 1140, then 348°T at 5.8 kn until 1210.

   Give the 1210 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 1500 you fix your position 339°T, 2.3 nm from Tern Island tower. You steer 234°T at 8.1 kn until 1525, then 164°T at 9.4 kn until 1535.

   Give the 1535 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 0915 you fix your position 270°T, 2.2 nm from Gannet Rock daybeacon. You steer 017°T at 4.1 kn until 0935, then 232°T at 8.4 kn until 0955.

   Give the 0955 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  

4. At 0905 you fix your position 055°T, 3.5 nm from Heron Point Light. You steer 340°T at 4.5 kn until 0930, then 116°T at 9.7 kn until 0945.

   Give the 0945 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 0945 you fix your position 342°T, 1.2 nm from Tern Island tower. You steer 236°T at 9.2 kn until 1000, then 158°T at 7.1 kn until 1010.

   Give the 1010 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 0855 you fix your position 226°T, 1.4 nm from Tern Island tower. You steer 246°T at 9.4 kn until 0910, then 166°T at 6.4 kn until 0920.

   Give the 0920 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 0910 you fix your position 245°T, 2.5 nm from Gannet Rock daybeacon. You steer 206°T at 4.1 kn until 0925, then 354°T at 9.9 kn until 0945.

   Give the 0945 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 1525 you fix your position 009°T, 1.1 nm from Heron Point Light. You steer 090°T at 9.8 kn until 1535, then 013°T at 7.6 kn until 1550.

   Give the 1550 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