Worksheet 528 · Skill 3

Dead reckoning

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1. At 1045 you fix your position 074°T, 3.3 nm from Westfield church spire. You steer 142°T at 4.3 kn until 1110, then 313°T at 4.0 kn until 1120.

   Give the 1120 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  

2. At 1410 you fix your position 066°T, 1.8 nm from Gannet Rock daybeacon. You steer 348°T at 7.0 kn until 1435, then 250°T at 4.4 kn until 1455.

   Give the 1455 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 0840 you fix your position 026°T, 2.4 nm from Tern Island tower. You steer 236°T at 8.9 kn until 0910, then 159°T at 4.7 kn until 0955.

   Give the 0955 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  

4. At 0730 you fix your position 352°T, 1.3 nm from Heron Point Light. You steer 097°T at 4.2 kn until 0815, then 277°T at 5.9 kn until 0830.

   Give the 0830 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 1405 you fix your position 230°T, 2.3 nm from Tern Island tower. You steer 092°T at 4.8 kn until 1445, then 265°T at 4.9 kn until 1515.

   Give the 1515 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 085°T, 2.8 nm from Westfield church spire. You steer 125°T at 5.2 kn until 1515, then 159°T at 5.8 kn until 1525.

   Give the 1525 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 1050 you fix your position 065°T, 3.0 nm from Westfield church spire. You steer 287°T at 6.2 kn until 1100, then 070°T at 7.8 kn until 1135.

   Give the 1135 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 1405 you fix your position 137°T, 1.3 nm from Gannet Rock daybeacon. You steer 027°T at 5.2 kn until 1420, then 330°T at 7.5 kn until 1450.

   Give the 1450 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