Worksheet 6 · Skill 3

Dead reckoning

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1. At 1540 you fix your position 022°T, 2.7 nm from Mill stack. You steer 103°T at 6.7 kn until 1625, then 320°T at 4.6 kn until 1640.

   Give the 1640 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  

2. At 1600 you fix your position 073°T, 2.3 nm from Westfield church spire. You steer 092°T at 8.4 kn until 1625, then 015°T at 4.1 kn until 1705.

   Give the 1705 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 1415 you fix your position 093°T, 2.0 nm from Westfield church spire. You steer 021°T at 6.5 kn until 1445, then 135°T at 5.1 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  

4. At 0935 you fix your position 162°T, 1.4 nm from Westfield church spire. You steer 072°T at 8.0 kn until 1010, then 040°T at 5.6 kn until 1025.

   Give the 1025 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 1100 you fix your position 055°T, 3.0 nm from Heron Point Light. You steer 040°T at 8.3 kn until 1115, then 212°T at 5.6 kn until 1145.

   Give the 1145 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 1430 you fix your position 037°T, 2.0 nm from Mill stack. You steer 082°T at 9.7 kn until 1445, then 050°T at 4.1 kn until 1530.

   Give the 1530 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 0930 you fix your position 240°T, 2.4 nm from Gannet Rock daybeacon. You steer 336°T at 9.8 kn until 0945, then 239°T at 4.2 kn until 1025.

   Give the 1025 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  

8. At 1535 you fix your position 207°T, 2.7 nm from Tern Island tower. You steer 274°T at 8.6 kn until 1545, then 150°T at 4.5 kn until 1605.

   Give the 1605 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