Worksheet 423 · Skill 3

Dead reckoning

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1. At 1505 you fix your position 035°T, 1.5 nm from Kittle water tank. You steer 263°T at 8.1 kn until 1515, then 077°T at 6.3 kn until 1525.

   Give the 1525 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

2. At 1045 you fix your position 283°T, 2.0 nm from Gannet Rock daybeacon. You steer 302°T at 7.2 kn until 1120, then 031°T at 4.8 kn until 1155.

   Give the 1155 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  

3. At 1110 you fix your position 055°T, 1.6 nm from Tern Island tower. You steer 144°T at 5.5 kn until 1140, then 105°T at 4.3 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 0915 you fix your position 259°T, 2.5 nm from Tern Island tower. You steer 092°T at 4.9 kn until 0930, then 316°T at 5.6 kn until 0955.

   Give the 0955 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 092°T, 3.7 nm from Westfield church spire. You steer 171°T at 6.2 kn until 1525, then 328°T at 10.0 kn until 1535.

   Give the 1535 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  

6. At 1115 you fix your position 037°T, 2.2 nm from Gannet Rock daybeacon. You steer 251°T at 7.9 kn until 1150, then 349°T at 4.5 kn until 1230.

   Give the 1230 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 1100 you fix your position 094°T, 3.0 nm from Westfield church spire. You steer 011°T at 4.5 kn until 1145, then 138°T at 7.6 kn until 1220.

   Give the 1220 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 0830 you fix your position 333°T, 1.4 nm from Tern Island tower. You steer 223°T at 5.6 kn until 0850, then 293°T at 7.5 kn until 0905.

   Give the 0905 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