Worksheet 360 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 337°T, 1.4 nm from Kittle water tank. You steer 273°T at 5.5 kn until 1030, then 080°T at 5.9 kn until 1105.

   Give the 1105 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  

2. At 1410 you fix your position 223°T, 2.4 nm from Tern Island tower. You steer 176°T at 8.3 kn until 1425, then 335°T at 7.9 kn until 1455.

   Give the 1455 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 1315 you fix your position 151°T, 1.5 nm from Westfield church spire. You steer 078°T at 4.4 kn until 1345, then 279°T at 8.0 kn until 1355.

   Give the 1355 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  

4. At 1100 you fix your position 046°T, 3.2 nm from Tern Island tower. You steer 259°T at 7.8 kn until 1140, then 311°T at 4.8 kn until 1155.

   Give the 1155 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 1245 you fix your position 207°T, 1.4 nm from Tern Island tower. You steer 193°T at 7.1 kn until 1305, then 349°T at 7.0 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  

6. At 1555 you fix your position 077°T, 0.8 nm from Gannet Rock daybeacon. You steer 146°T at 4.3 kn until 1635, then 279°T at 7.1 kn until 1700.

   Give the 1700 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  

7. At 1435 you fix your position 286°T, 3.7 nm from Tern Island tower. You steer 063°T at 9.7 kn until 1445, then 188°T at 9.5 kn until 1520.

   Give the 1520 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 0950 you fix your position 300°T, 1.9 nm from Kittle water tank. You steer 279°T at 6.6 kn until 1015, then 042°T at 8.7 kn until 1040.

   Give the 1040 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