Worksheet 84 · Skill 3

Dead reckoning

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1. At 1330 you fix your position 065°T, 3.7 nm from Westfield church spire. You steer 039°T at 4.7 kn until 1340, then 153°T at 10.0 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  

2. At 1325 you fix your position 264°T, 2.7 nm from Tern Island tower. You steer 024°T at 4.2 kn until 1355, then 239°T at 5.4 kn until 1405.

   Give the 1405 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 1245 you fix your position 330°T, 2.1 nm from Mill stack. You steer 061°T at 9.1 kn until 1300, then 275°T at 7.4 kn until 1330.

   Give the 1330 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 1235 you fix your position 257°T, 1.6 nm from Gannet Rock daybeacon. You steer 286°T at 4.5 kn until 1320, then 341°T at 5.1 kn until 1345.

   Give the 1345 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 0755 you fix your position 344°T, 2.8 nm from Mill stack. You steer 315°T at 9.6 kn until 0810, then 274°T at 5.6 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  

6. At 1450 you fix your position 002°T, 2.3 nm from Mill stack. You steer 284°T at 5.6 kn until 1525, then 045°T at 8.5 kn until 1540.

   Give the 1540 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 1140 you fix your position 276°T, 1.8 nm from Tern Island tower. You steer 156°T at 4.9 kn until 1215, then 283°T at 8.7 kn until 1255.

   Give the 1255 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 0725 you fix your position 057°T, 1.1 nm from Gannet Rock daybeacon. You steer 355°T at 4.2 kn until 0800, then 127°T at 4.5 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