Worksheet 658 · Skill 3

Dead reckoning

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1. At 0830 you fix your position 029°T, 2.6 nm from Heron Point Light. You steer 096°T at 9.6 kn until 0900, then 264°T at 8.6 kn until 0920.

   Give the 0920 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 0710 you fix your position 008°T, 1.9 nm from Gannet Rock daybeacon. You steer 206°T at 6.6 kn until 0745, then 122°T at 6.1 kn until 0755.

   Give the 0755 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 1035 you fix your position 273°T, 3.2 nm from Tern Island tower. You steer 193°T at 5.8 kn until 1115, then 343°T at 5.4 kn until 1200.

   Give the 1200 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 1045 you fix your position 243°T, 3.4 nm from Tern Island tower. You steer 147°T at 7.0 kn until 1110, then 000°T at 5.2 kn until 1150.

   Give the 1150 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  

5. At 0950 you fix your position 222°T, 3.3 nm from Tern Island tower. You steer 239°T at 6.2 kn until 1000, then 287°T at 5.1 kn until 1015.

   Give the 1015 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  

6. At 1350 you fix your position 250°T, 2.1 nm from Tern Island tower. You steer 101°T at 8.3 kn until 1400, then 274°T at 5.8 kn until 1410.

   Give the 1410 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 1315 you fix your position 018°T, 2.4 nm from Mill stack. You steer 072°T at 7.6 kn until 1325, then 206°T at 5.3 kn until 1345.

   Give the 1345 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 0745 you fix your position 281°T, 2.1 nm from Gannet Rock daybeacon. You steer 340°T at 4.4 kn until 0755, then 274°T at 6.8 kn until 0815.

   Give the 0815 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