Worksheet 98 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 205°T, 1.4 nm from Gannet Rock daybeacon. You steer 312°T at 5.9 kn until 0800, then 075°T at 5.5 kn until 0810.

   Give the 0810 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 0910 you fix your position 346°T, 2.0 nm from Heron Point Light. You steer 110°T at 7.7 kn until 0935, then 270°T at 7.0 kn until 0950.

   Give the 0950 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  

3. At 0940 you fix your position 345°T, 1.5 nm from Tern Island tower. You steer 274°T at 6.6 kn until 1015, then 241°T at 7.1 kn until 1035.

   Give the 1035 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  

4. At 1055 you fix your position 301°T, 2.2 nm from Tern Island tower. You steer 334°T at 5.0 kn until 1105, then 160°T at 9.1 kn until 1115.

   Give the 1115 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 0935 you fix your position 279°T, 3.0 nm from Tern Island tower. You steer 247°T at 4.9 kn until 0955, then 020°T at 5.0 kn until 1020.

   Give the 1020 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 1250 you fix your position 217°T, 2.6 nm from Tern Island tower. You steer 066°T at 6.6 kn until 1305, then 268°T at 7.1 kn until 1340.

   Give the 1340 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  

7. At 0720 you fix your position 140°T, 1.0 nm from Gannet Rock daybeacon. You steer 028°T at 7.5 kn until 0755, then 205°T at 9.5 kn until 0810.

   Give the 0810 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 1355 you fix your position 312°T, 3.1 nm from Tern Island tower. You steer 141°T at 4.1 kn until 1405, then 273°T at 5.4 kn until 1415.

   Give the 1415 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