Worksheet 730 · Skill 3

Dead reckoning

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1. At 0745 you fix your position 020°T, 2.2 nm from Mill stack. You steer 126°T at 4.6 kn until 0800, then 081°T at 4.1 kn until 0840.

   Give the 0840 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 1310 you fix your position 287°T, 3.8 nm from Tern Island tower. You steer 137°T at 9.4 kn until 1320, then 248°T at 8.9 kn until 1350.

   Give the 1350 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 1425 you fix your position 227°T, 2.0 nm from Tern Island tower. You steer 108°T at 4.6 kn until 1455, then 265°T at 7.6 kn until 1510.

   Give the 1510 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 1400 you fix your position 282°T, 3.1 nm from Tern Island tower. You steer 117°T at 4.9 kn until 1420, then 240°T at 7.7 kn until 1500.

   Give the 1500 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  

5. At 1300 you fix your position 246°T, 2.2 nm from Tern Island tower. You steer 004°T at 5.4 kn until 1330, then 191°T at 6.3 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  

6. At 0755 you fix your position 215°T, 2.6 nm from Tern Island tower. You steer 129°T at 7.5 kn until 0805, then 058°T at 5.6 kn until 0845.

   Give the 0845 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 1345 you fix your position 046°T, 3.6 nm from Gannet Rock daybeacon. You steer 357°T at 7.1 kn until 1400, then 265°T at 4.0 kn until 1440.

   Give the 1440 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 1220 you fix your position 317°T, 3.2 nm from Tern Island tower. You steer 232°T at 7.4 kn until 1245, then 123°T at 4.2 kn until 1305.

   Give the 1305 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