Worksheet 638 · Skill 3

Dead reckoning

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1. At 1220 you fix your position 352°T, 3.5 nm from Mill stack. You steer 354°T at 4.2 kn until 1300, then 269°T at 5.5 kn until 1345.

   Give the 1345 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 1225 you fix your position 045°T, 3.4 nm from Heron Point Light. You steer 104°T at 4.4 kn until 1310, then 036°T at 6.6 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  

3. At 1500 you fix your position 317°T, 3.1 nm from Tern Island tower. You steer 223°T at 4.0 kn until 1515, then 175°T at 9.4 kn until 1555.

   Give the 1555 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  

4. At 0845 you fix your position 042°T, 2.1 nm from Mill stack. You steer 321°T at 5.7 kn until 0915, then 002°T at 10.0 kn until 0925.

   Give the 0925 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 1040 you fix your position 215°T, 3.1 nm from Tern Island tower. You steer 298°T at 4.8 kn until 1105, then 176°T at 7.8 kn until 1130.

   Give the 1130 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  

6. At 1120 you fix your position 270°T, 3.5 nm from Tern Island tower. You steer 064°T at 9.7 kn until 1135, then 294°T at 5.6 kn until 1150.

   Give the 1150 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 1135 you fix your position 266°T, 2.1 nm from Tern Island tower. You steer 187°T at 7.8 kn until 1200, then 234°T at 6.5 kn until 1210.

   Give the 1210 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  

8. At 0710 you fix your position 031°T, 1.8 nm from Mill stack. You steer 092°T at 7.2 kn until 0720, then 004°T at 6.5 kn until 0730.

   Give the 0730 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