Worksheet 551 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 037°T, 2.6 nm from Westfield church spire. You steer 094°T at 8.0 kn until 0810, then 276°T at 9.3 kn until 0830.

   Give the 0830 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  

2. At 1110 you fix your position 099°T, 2.5 nm from Westfield church spire. You steer 348°T at 4.3 kn until 1145, then 108°T at 6.7 kn until 1205.

   Give the 1205 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 0820 you fix your position 248°T, 2.8 nm from Tern Island tower. You steer 170°T at 8.7 kn until 0845, then 047°T at 6.1 kn until 0855.

   Give the 0855 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 0910 you fix your position 029°T, 2.4 nm from Heron Point Light. You steer 100°T at 7.3 kn until 0925, then 006°T at 4.6 kn until 0950.

   Give the 0950 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 1245 you fix your position 029°T, 2.8 nm from Tern Island tower. You steer 267°T at 4.6 kn until 1305, then 085°T at 4.0 kn until 1325.

   Give the 1325 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 1335 you fix your position 353°T, 2.7 nm from Mill stack. You steer 325°T at 4.0 kn until 1400, then 087°T at 7.7 kn until 1415.

   Give the 1415 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 0745 you fix your position 061°T, 3.3 nm from Westfield church spire. You steer 176°T at 9.3 kn until 0755, then 324°T at 6.8 kn until 0820.

   Give the 0820 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  

8. At 0945 you fix your position 025°T, 2.8 nm from Heron Point Light. You steer 012°T at 9.7 kn until 1010, then 194°T at 7.0 kn until 1030.

   Give the 1030 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