Worksheet 550 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 223°T, 1.6 nm from Tern Island tower. You steer 246°T at 6.8 kn until 1535, then 030°T at 5.1 kn until 1605.

   Give the 1605 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 279°T, 1.8 nm from Gannet Rock daybeacon. You steer 041°T at 5.3 kn until 1145, then 200°T at 5.4 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  

3. At 1325 you fix your position 295°T, 3.7 nm from Tern Island tower. You steer 232°T at 8.4 kn until 1345, then 087°T at 9.3 kn until 1410.

   Give the 1410 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 1120 you fix your position 104°T, 2.5 nm from Westfield church spire. You steer 079°T at 8.1 kn until 1135, then 351°T at 5.7 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 0950 you fix your position 059°T, 1.8 nm from Kittle water tank. You steer 358°T at 7.0 kn until 1000, then 241°T at 6.8 kn until 1020.

   Give the 1020 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

6. At 0810 you fix your position 005°T, 1.9 nm from Westfield church spire. You steer 072°T at 4.8 kn until 0845, then 102°T at 8.4 kn until 0855.

   Give the 0855 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 1020 you fix your position 331°T, 1.8 nm from Heron Point Light. You steer 005°T at 5.4 kn until 1035, then 194°T at 8.0 kn until 1045.

   Give the 1045 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  

8. At 0715 you fix your position 270°T, 3.1 nm from Tern Island tower. You steer 053°T at 6.2 kn until 0745, then 108°T at 9.3 kn until 0805.

   Give the 0805 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