Worksheet 67 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 074°T, 2.6 nm from Westfield church spire. You steer 290°T at 8.0 kn until 1305, then 085°T at 7.6 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  

2. At 1115 you fix your position 035°T, 1.9 nm from Kittle water tank. You steer 254°T at 6.0 kn until 1135, then 001°T at 7.2 kn until 1150.

   Give the 1150 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 0720 you fix your position 014°T, 0.9 nm from Heron Point Light. You steer 120°T at 6.6 kn until 0740, then 082°T at 8.9 kn until 0810.

   Give the 0810 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 0845 you fix your position 059°T, 2.9 nm from Heron Point Light. You steer 022°T at 8.7 kn until 0855, then 313°T at 7.2 kn until 0930.

   Give the 0930 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 0900 you fix your position 039°T, 3.5 nm from Heron Point Light. You steer 194°T at 4.2 kn until 0920, then 106°T at 7.7 kn until 0940.

   Give the 0940 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

6. At 1230 you fix your position 078°T, 0.8 nm from Gannet Rock daybeacon. You steer 022°T at 5.8 kn until 1305, then 280°T at 6.8 kn until 1335.

   Give the 1335 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 1450 you fix your position 339°T, 1.8 nm from Mill stack. You steer 354°T at 8.5 kn until 1530, then 179°T at 4.1 kn until 1600.

   Give the 1600 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  

8. At 1125 you fix your position 088°T, 2.8 nm from Westfield church spire. You steer 042°T at 6.2 kn until 1205, then 181°T at 9.6 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