Worksheet 155 · Skill 3

Dead reckoning

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1. At 0830 you fix your position 250°T, 2.2 nm from Tern Island tower. You steer 303°T at 5.1 kn until 0850, then 157°T at 4.9 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  

2. At 0850 you fix your position 253°T, 2.8 nm from Gannet Rock daybeacon. You steer 234°T at 4.9 kn until 0905, then 121°T at 4.5 kn until 0930.

   Give the 0930 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  

3. At 1540 you fix your position 082°T, 1.3 nm from Westfield church spire. You steer 316°T at 7.1 kn until 1550, then 138°T at 7.7 kn until 1615.

   Give the 1615 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  

4. At 1345 you fix your position 192°T, 1.2 nm from Tern Island tower. You steer 145°T at 5.9 kn until 1425, then 025°T at 9.4 kn until 1455.

   Give the 1455 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 0725 you fix your position 030°T, 3.6 nm from Heron Point Light. You steer 135°T at 7.6 kn until 0735, then 272°T at 6.5 kn until 0800.

   Give the 0800 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  

6. At 1050 you fix your position 262°T, 1.7 nm from Tern Island tower. You steer 257°T at 6.4 kn until 1130, then 133°T at 7.6 kn until 1205.

   Give the 1205 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  

7. At 0750 you fix your position 062°T, 2.9 nm from Gannet Rock daybeacon. You steer 171°T at 7.8 kn until 0805, then 351°T at 4.0 kn until 0815.

   Give the 0815 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  

8. At 1540 you fix your position 155°T, 2.6 nm from Tern Island tower. You steer 297°T at 8.7 kn until 1600, then 245°T at 9.4 kn until 1625.

   Give the 1625 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