Worksheet 415 · Skill 3

Dead reckoning

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1. At 1105 you fix your position 005°T, 3.2 nm from Mill stack. You steer 089°T at 8.6 kn until 1115, then 324°T at 4.6 kn until 1125.

   Give the 1125 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 0820 you fix your position 053°T, 2.0 nm from Heron Point Light. You steer 007°T at 9.8 kn until 0830, then 117°T at 8.0 kn until 0905.

   Give the 0905 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 0825 you fix your position 225°T, 1.5 nm from Gannet Rock daybeacon. You steer 019°T at 5.0 kn until 0910, then 323°T at 5.7 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  

4. At 1040 you fix your position 041°T, 4.0 nm from Gannet Rock daybeacon. You steer 219°T at 4.3 kn until 1055, then 030°T at 7.1 kn until 1115.

   Give the 1115 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 0700 you fix your position 278°T, 2.2 nm from Gannet Rock daybeacon. You steer 314°T at 4.7 kn until 0745, then 232°T at 4.0 kn until 0805.

   Give the 0805 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 1015 you fix your position 259°T, 2.9 nm from Tern Island tower. You steer 327°T at 4.9 kn until 1055, then 146°T at 6.7 kn until 1125.

   Give the 1125 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 1455 you fix your position 259°T, 2.5 nm from Gannet Rock daybeacon. You steer 309°T at 5.2 kn until 1520, then 005°T at 8.8 kn until 1530.

   Give the 1530 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 0730 you fix your position 044°T, 3.7 nm from Westfield church spire. You steer 166°T at 9.4 kn until 0755, then 254°T at 4.1 kn until 0805.

   Give the 0805 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