Worksheet 612 · Skill 3

Dead reckoning

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1. At 1115 you fix your position 065°T, 1.3 nm from Gannet Rock daybeacon. You steer 277°T at 4.9 kn until 1140, then 215°T at 9.8 kn until 1205.

   Give the 1205 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  

2. At 0950 you fix your position 075°T, 2.9 nm from Westfield church spire. You steer 350°T at 5.8 kn until 1010, then 132°T at 8.7 kn until 1050.

   Give the 1050 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 1245 you fix your position 272°T, 3.2 nm from Tern Island tower. You steer 208°T at 9.3 kn until 1305, then 100°T at 8.3 kn until 1315.

   Give the 1315 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 0750 you fix your position 057°T, 2.5 nm from Westfield church spire. You steer 347°T at 4.2 kn until 0810, then 195°T at 8.9 kn until 0820.

   Give the 0820 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  

5. At 1155 you fix your position 343°T, 1.0 nm from Gannet Rock daybeacon. You steer 238°T at 5.1 kn until 1230, then 066°T at 7.1 kn until 1245.

   Give the 1245 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  

6. At 1040 you fix your position 058°T, 3.4 nm from Heron Point Light. You steer 070°T at 9.5 kn until 1110, then 138°T at 5.0 kn until 1145.

   Give the 1145 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 1205 you fix your position 010°T, 2.4 nm from Westfield church spire. You steer 132°T at 7.3 kn until 1240, then 254°T at 8.8 kn until 1305.

   Give the 1305 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  

8. At 1055 you fix your position 276°T, 3.7 nm from Tern Island tower. You steer 079°T at 9.9 kn until 1135, then 211°T at 8.7 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