Worksheet 450 · Skill 3

Dead reckoning

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1. At 1425 you fix your position 069°T, 2.2 nm from Gannet Rock daybeacon. You steer 196°T at 4.8 kn until 1445, then 357°T at 7.1 kn until 1530.

   Give the 1530 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 1200 you fix your position 054°T, 3.5 nm from Heron Point Light. You steer 066°T at 5.8 kn until 1225, then 137°T at 5.4 kn until 1310.

   Give the 1310 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  

3. At 1240 you fix your position 292°T, 2.6 nm from Tern Island tower. You steer 143°T at 9.6 kn until 1300, then 286°T at 5.3 kn until 1315.

   Give the 1315 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 1300 you fix your position 116°T, 1.9 nm from Westfield church spire. You steer 000°T at 5.9 kn until 1320, then 197°T at 6.7 kn until 1335.

   Give the 1335 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 1125 you fix your position 208°T, 2.0 nm from Gannet Rock daybeacon. You steer 324°T at 6.2 kn until 1145, then 252°T at 7.2 kn until 1215.

   Give the 1215 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  

6. At 0740 you fix your position 082°T, 1.9 nm from Westfield church spire. You steer 078°T at 5.6 kn until 0805, then 187°T at 5.5 kn until 0845.

   Give the 0845 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 0905 you fix your position 002°T, 2.2 nm from Heron Point Light. You steer 115°T at 5.7 kn until 0920, then 289°T at 4.8 kn until 0945.

   Give the 0945 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 0845 you fix your position 353°T, 1.9 nm from Heron Point Light. You steer 054°T at 4.1 kn until 0910, then 243°T at 7.4 kn until 0920.

   Give the 0920 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