Worksheet 786 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 026°T, 2.2 nm from Tern Island tower. You steer 131°T at 8.6 kn until 1455, then 190°T at 4.4 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  

2. At 1200 you fix your position 021°T, 1.9 nm from Gannet Rock daybeacon. You steer 348°T at 5.6 kn until 1210, then 092°T at 4.5 kn until 1230.

   Give the 1230 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  

3. At 0730 you fix your position 089°T, 2.9 nm from Gannet Rock daybeacon. You steer 283°T at 9.8 kn until 0745, then 358°T at 6.4 kn until 0810.

   Give the 0810 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 1145 you fix your position 256°T, 3.1 nm from Tern Island tower. You steer 011°T at 8.6 kn until 1200, then 082°T at 9.6 kn until 1215.

   Give the 1215 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 0830 you fix your position 025°T, 0.8 nm from Heron Point Light. You steer 056°T at 8.7 kn until 0850, then 343°T at 5.6 kn until 0910.

   Give the 0910 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 0920 you fix your position 352°T, 2.9 nm from Mill stack. You steer 162°T at 4.3 kn until 0940, then 303°T at 9.8 kn until 0955.

   Give the 0955 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  

7. At 1045 you fix your position 282°T, 1.8 nm from Gannet Rock daybeacon. You steer 250°T at 5.8 kn until 1125, then 002°T at 5.5 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  

8. At 1505 you fix your position 067°T, 3.5 nm from Westfield church spire. You steer 170°T at 4.4 kn until 1530, then 212°T at 6.0 kn until 1545.

   Give the 1545 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