Worksheet 750 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 050°T, 1.4 nm from Tern Island tower. You steer 118°T at 8.1 kn until 0905, then 048°T at 4.4 kn until 0915.

   Give the 0915 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  

2. At 1500 you fix your position 336°T, 2.6 nm from Kittle water tank. You steer 270°T at 10.0 kn until 1530, then 359°T at 5.9 kn until 1540.

   Give the 1540 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 0700 you fix your position 233°T, 2.6 nm from Tern Island tower. You steer 191°T at 6.1 kn until 0720, then 299°T at 5.2 kn until 0740.

   Give the 0740 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 1335 you fix your position 036°T, 3.0 nm from Heron Point Light. You steer 037°T at 8.3 kn until 1415, then 204°T at 6.5 kn until 1445.

   Give the 1445 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 1450 you fix your position 083°T, 2.3 nm from Westfield church spire. You steer 003°T at 7.6 kn until 1500, then 196°T at 6.6 kn until 1520.

   Give the 1520 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  

6. At 1245 you fix your position 022°T, 2.8 nm from Gannet Rock daybeacon. You steer 319°T at 7.6 kn until 1305, then 152°T at 5.4 kn until 1335.

   Give the 1335 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  

7. At 1305 you fix your position 028°T, 2.1 nm from Mill stack. You steer 321°T at 6.8 kn until 1325, then 034°T at 5.6 kn until 1345.

   Give the 1345 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  

8. At 1415 you fix your position 189°T, 1.2 nm from Gannet Rock daybeacon. You steer 298°T at 8.9 kn until 1445, then 130°T at 4.7 kn until 1505.

   Give the 1505 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