Worksheet 635 · Skill 3

Dead reckoning

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1. At 1045 you fix your position 334°T, 1.4 nm from Gannet Rock daybeacon. You steer 032°T at 5.9 kn until 1125, then 249°T at 7.3 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  

2. At 1435 you fix your position 328°T, 2.8 nm from Kittle water tank. You steer 139°T at 7.7 kn until 1445, then 318°T at 5.0 kn until 1500.

   Give the 1500 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

3. At 1405 you fix your position 044°T, 4.7 nm from Westfield church spire. You steer 128°T at 9.7 kn until 1420, then 030°T at 8.4 kn until 1430.

   Give the 1430 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 1055 you fix your position 006°T, 1.6 nm from Kittle water tank. You steer 033°T at 6.0 kn until 1125, then 329°T at 6.0 kn until 1135.

   Give the 1135 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 0955 you fix your position 092°T, 2.2 nm from Heron Point Light. You steer 087°T at 6.1 kn until 1015, then 290°T at 9.6 kn until 1025.

   Give the 1025 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  

6. At 1450 you fix your position 265°T, 1.0 nm from Gannet Rock daybeacon. You steer 039°T at 8.8 kn until 1525, then 166°T at 8.5 kn until 1545.

   Give the 1545 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 1405 you fix your position 103°T, 2.5 nm from Westfield church spire. You steer 115°T at 4.7 kn until 1430, then 067°T at 4.7 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  

8. At 1420 you fix your position 326°T, 1.8 nm from Tern Island tower. You steer 057°T at 9.0 kn until 1430, then 261°T at 6.8 kn until 1505.

   Give the 1505 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