Worksheet 310 · Skill 3

Dead reckoning

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1. At 0925 you fix your position 036°T, 2.1 nm from Westfield church spire. You steer 002°T at 6.2 kn until 0940, then 095°T at 9.2 kn until 1000.

   Give the 1000 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 0700 you fix your position 260°T, 2.8 nm from Tern Island tower. You steer 123°T at 8.1 kn until 0745, then 289°T at 8.6 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  

3. At 0920 you fix your position 007°T, 2.4 nm from Heron Point Light. You steer 121°T at 9.4 kn until 0935, then 081°T at 5.2 kn until 1010.

   Give the 1010 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  

4. At 0730 you fix your position 068°T, 3.0 nm from Westfield church spire. You steer 321°T at 7.0 kn until 0750, then 193°T at 4.1 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  

5. At 1555 you fix your position 298°T, 1.8 nm from Tern Island tower. You steer 292°T at 5.5 kn until 1620, then 239°T at 5.1 kn until 1705.

   Give the 1705 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 1255 you fix your position 291°T, 3.9 nm from Tern Island tower. You steer 183°T at 4.6 kn until 1340, then 050°T at 4.5 kn until 1355.

   Give the 1355 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 1425 you fix your position 046°T, 1.4 nm from Tern Island tower. You steer 085°T at 6.0 kn until 1435, then 132°T at 7.2 kn until 1505.

   Give the 1505 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 0925 you fix your position 074°T, 2.3 nm from Westfield church spire. You steer 152°T at 7.8 kn until 0940, then 185°T at 7.2 kn until 0950.

   Give the 0950 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