Worksheet 441 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 332°T, 1.0 nm from Heron Point Light. You steer 336°T at 4.9 kn until 1005, then 067°T at 5.5 kn until 1020.

   Give the 1020 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  

2. At 0710 you fix your position 056°T, 3.8 nm from Westfield church spire. You steer 254°T at 9.4 kn until 0720, then 022°T at 7.2 kn until 0730.

   Give the 0730 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 1135 you fix your position 059°T, 3.0 nm from Gannet Rock daybeacon. You steer 240°T at 4.8 kn until 1150, then 282°T at 4.2 kn until 1205.

   Give the 1205 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  

4. At 1240 you fix your position 346°T, 2.4 nm from Mill stack. You steer 050°T at 5.2 kn until 1305, then 327°T at 5.6 kn until 1340.

   Give the 1340 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 1440 you fix your position 233°T, 1.2 nm from Gannet Rock daybeacon. You steer 020°T at 7.3 kn until 1450, then 056°T at 5.6 kn until 1530.

   Give the 1530 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  

6. At 1305 you fix your position 262°T, 1.6 nm from Tern Island tower. You steer 167°T at 4.7 kn until 1340, then 008°T at 4.2 kn until 1355.

   Give the 1355 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 0715 you fix your position 024°T, 2.9 nm from Heron Point Light. You steer 323°T at 5.0 kn until 0800, then 218°T at 5.3 kn until 0810.

   Give the 0810 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  

8. At 1300 you fix your position 015°T, 2.8 nm from Westfield church spire. You steer 014°T at 5.2 kn until 1310, then 134°T at 4.0 kn until 1330.

   Give the 1330 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