Worksheet 645 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 218°T, 2.9 nm from Tern Island tower. You steer 132°T at 8.3 kn until 1315, then 268°T at 5.8 kn until 1350.

   Give the 1350 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 1215 you fix your position 097°T, 1.8 nm from Tern Island tower. You steer 346°T at 5.3 kn until 1225, then 155°T at 9.1 kn until 1250.

   Give the 1250 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 1415 you fix your position 026°T, 3.2 nm from Heron Point Light. You steer 096°T at 6.2 kn until 1440, then 006°T at 5.2 kn until 1500.

   Give the 1500 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 1545 you fix your position 320°T, 2.1 nm from Mill stack. You steer 008°T at 4.3 kn until 1555, then 069°T at 9.8 kn until 1615.

   Give the 1615 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 1510 you fix your position 051°T, 3.6 nm from Tern Island tower. You steer 115°T at 5.2 kn until 1535, then 284°T at 4.7 kn until 1620.

   Give the 1620 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  

6. At 1435 you fix your position 209°T, 2.3 nm from Gannet Rock daybeacon. You steer 273°T at 7.0 kn until 1500, then 235°T at 8.0 kn until 1510.

   Give the 1510 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 0830 you fix your position 049°T, 2.4 nm from Tern Island tower. You steer 064°T at 4.8 kn until 0845, then 123°T at 9.2 kn until 0855.

   Give the 0855 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 0940 you fix your position 019°T, 2.9 nm from Westfield church spire. You steer 145°T at 8.6 kn until 1010, then 192°T at 4.0 kn until 1040.

   Give the 1040 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