Worksheet 336 · Skill 3

Dead reckoning

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1. At 1305 you fix your position 354°T, 1.9 nm from Heron Point Light. You steer 107°T at 4.0 kn until 1345, then 276°T at 5.0 kn until 1410.

   Give the 1410 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  

2. At 0815 you fix your position 000°T, 2.4 nm from Mill stack. You steer 005°T at 6.3 kn until 0845, then 234°T at 5.4 kn until 0925.

   Give the 0925 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  

3. At 1050 you fix your position 335°T, 2.5 nm from Mill stack. You steer 281°T at 9.1 kn until 1100, then 337°T at 6.9 kn until 1130.

   Give the 1130 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  

4. At 0905 you fix your position 249°T, 1.0 nm from Gannet Rock daybeacon. You steer 326°T at 4.6 kn until 0925, then 234°T at 5.5 kn until 1010.

   Give the 1010 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 1305 you fix your position 042°T, 1.3 nm from Gannet Rock daybeacon. You steer 178°T at 7.5 kn until 1330, then 285°T at 9.0 kn until 1350.

   Give the 1350 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 1555 you fix your position 076°T, 2.1 nm from Heron Point Light. You steer 128°T at 10.0 kn until 1605, then 265°T at 5.2 kn until 1620.

   Give the 1620 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  

7. At 1430 you fix your position 200°T, 2.1 nm from Gannet Rock daybeacon. You steer 327°T at 7.3 kn until 1510, then 166°T at 9.5 kn until 1535.

   Give the 1535 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  

8. At 1325 you fix your position 291°T, 2.0 nm from Tern Island tower. You steer 057°T at 9.2 kn until 1335, then 291°T at 5.7 kn until 1355.

   Give the 1355 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