Worksheet 348 · Skill 3

Dead reckoning

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1. At 1445 you fix your position 243°T, 3.1 nm from Tern Island tower. You steer 176°T at 4.4 kn until 1510, then 243°T at 6.3 kn until 1520.

   Give the 1520 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 0700 you fix your position 297°T, 4.2 nm from Tern Island tower. You steer 208°T at 4.2 kn until 0740, then 067°T at 6.5 kn until 0825.

   Give the 0825 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 0910 you fix your position 223°T, 2.7 nm from Tern Island tower. You steer 142°T at 6.8 kn until 0945, then 296°T at 8.3 kn until 1025.

   Give the 1025 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 1225 you fix your position 121°T, 1.1 nm from Westfield church spire. You steer 108°T at 8.3 kn until 1310, then 293°T at 5.2 kn until 1345.

   Give the 1345 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 1140 you fix your position 304°T, 1.6 nm from Gannet Rock daybeacon. You steer 288°T at 6.0 kn until 1220, then 124°T at 4.4 kn until 1230.

   Give the 1230 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 1500 you fix your position 013°T, 1.9 nm from Mill stack. You steer 074°T at 4.2 kn until 1535, then 299°T at 5.2 kn until 1605.

   Give the 1605 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 0950 you fix your position 294°T, 1.6 nm from Gannet Rock daybeacon. You steer 240°T at 4.4 kn until 1005, then 137°T at 5.6 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  

8. At 0855 you fix your position 286°T, 1.8 nm from Gannet Rock daybeacon. You steer 153°T at 9.1 kn until 0915, then 316°T at 7.8 kn until 0940.

   Give the 0940 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