Worksheet 655 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 075°T, 3.7 nm from Westfield church spire. You steer 351°T at 8.9 kn until 1000, then 206°T at 7.4 kn until 1045.

   Give the 1045 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 0725 you fix your position 019°T, 2.2 nm from Heron Point Light. You steer 331°T at 4.4 kn until 0800, then 123°T at 7.9 kn until 0815.

   Give the 0815 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 1035 you fix your position 055°T, 1.1 nm from Heron Point Light. You steer 334°T at 9.1 kn until 1050, then 127°T at 6.1 kn until 1115.

   Give the 1115 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 1200 you fix your position 020°T, 1.2 nm from Kittle water tank. You steer 005°T at 6.3 kn until 1215, then 245°T at 4.3 kn until 1230.

   Give the 1230 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 1520 you fix your position 336°T, 1.5 nm from Kittle water tank. You steer 095°T at 8.9 kn until 1530, then 327°T at 7.6 kn until 1540.

   Give the 1540 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 0850 you fix your position 284°T, 3.2 nm from Tern Island tower. You steer 116°T at 4.4 kn until 0905, then 354°T at 8.5 kn until 0915.

   Give the 0915 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 1350 you fix your position 071°T, 1.3 nm from Westfield church spire. You steer 124°T at 4.6 kn until 1400, then 294°T at 4.3 kn until 1410.

   Give the 1410 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 1315 you fix your position 031°T, 1.4 nm from Westfield church spire. You steer 114°T at 9.9 kn until 1345, then 164°T at 9.7 kn until 1405.

   Give the 1405 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