Worksheet 768 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 067°T, 1.5 nm from Westfield church spire. You steer 178°T at 9.9 kn until 1235, then 110°T at 5.9 kn until 1320.

   Give the 1320 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  

2. At 1305 you fix your position 131°T, 2.0 nm from Westfield church spire. You steer 088°T at 10.0 kn until 1315, then 153°T at 6.8 kn until 1325.

   Give the 1325 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 0900 you fix your position 068°T, 2.1 nm from Westfield church spire. You steer 030°T at 4.8 kn until 0935, then 087°T at 6.4 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  

4. At 1100 you fix your position 061°T, 2.0 nm from Gannet Rock daybeacon. You steer 299°T at 4.5 kn until 1110, then 094°T at 5.1 kn until 1125.

   Give the 1125 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 0700 you fix your position 040°T, 2.8 nm from Westfield church spire. You steer 068°T at 6.9 kn until 0735, then 099°T at 5.6 kn until 0800.

   Give the 0800 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 1010 you fix your position 253°T, 3.7 nm from Tern Island tower. You steer 184°T at 6.3 kn until 1020, then 356°T at 6.4 kn until 1040.

   Give the 1040 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 0920 you fix your position 047°T, 2.4 nm from Heron Point Light. You steer 353°T at 6.0 kn until 0945, then 201°T at 6.7 kn until 1015.

   Give the 1015 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  

8. At 1505 you fix your position 234°T, 3.4 nm from Tern Island tower. You steer 336°T at 5.8 kn until 1530, then 242°T at 5.6 kn until 1545.

   Give the 1545 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