Worksheet 617 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 265°T, 3.5 nm from Tern Island tower. You steer 337°T at 4.2 kn until 1410, then 168°T at 8.0 kn until 1435.

   Give the 1435 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 1100 you fix your position 228°T, 2.1 nm from Tern Island tower. You steer 301°T at 8.7 kn until 1115, then 072°T at 5.6 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  

3. At 1315 you fix your position 359°T, 2.1 nm from Heron Point Light. You steer 083°T at 9.7 kn until 1325, then 245°T at 6.9 kn until 1340.

   Give the 1340 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 1455 you fix your position 190°T, 1.7 nm from Tern Island tower. You steer 236°T at 4.0 kn until 1505, then 074°T at 8.5 kn until 1520.

   Give the 1520 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  

5. At 0835 you fix your position 097°T, 2.5 nm from Gannet Rock daybeacon. You steer 257°T at 7.0 kn until 0905, then 355°T at 5.2 kn until 0915.

   Give the 0915 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 1355 you fix your position 297°T, 4.3 nm from Tern Island tower. You steer 156°T at 4.6 kn until 1425, then 043°T at 7.6 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  

7. At 0930 you fix your position 064°T, 1.9 nm from Westfield church spire. You steer 285°T at 4.9 kn until 0945, then 065°T at 9.9 kn until 1005.

   Give the 1005 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 0750 you fix your position 294°T, 3.1 nm from Tern Island tower. You steer 149°T at 8.5 kn until 0830, then 037°T at 4.5 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