Worksheet 149 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 059°T, 2.9 nm from Tern Island tower. You steer 192°T at 9.8 kn until 0805, then 260°T at 7.7 kn until 0850.

   Give the 0850 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  

2. At 0950 you fix your position 279°T, 1.9 nm from Gannet Rock daybeacon. You steer 305°T at 5.2 kn until 1015, then 182°T at 5.4 kn until 1040.

   Give the 1040 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  

3. At 1545 you fix your position 042°T, 4.2 nm from Westfield church spire. You steer 148°T at 5.7 kn until 1600, then 186°T at 9.9 kn until 1625.

   Give the 1625 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 0755 you fix your position 227°T, 1.6 nm from Gannet Rock daybeacon. You steer 279°T at 9.9 kn until 0830, then 081°T at 9.3 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  

5. At 0710 you fix your position 061°T, 1.2 nm from Westfield church spire. You steer 126°T at 9.8 kn until 0750, then 261°T at 8.4 kn until 0810.

   Give the 0810 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 1520 you fix your position 065°T, 3.4 nm from Westfield church spire. You steer 154°T at 4.8 kn until 1600, then 231°T at 4.9 kn until 1610.

   Give the 1610 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 1240 you fix your position 033°T, 3.4 nm from Gannet Rock daybeacon. You steer 183°T at 6.7 kn until 1325, then 031°T at 9.1 kn until 1340.

   Give the 1340 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  

8. At 1210 you fix your position 027°T, 3.1 nm from Gannet Rock daybeacon. You steer 298°T at 5.7 kn until 1225, then 050°T at 5.6 kn until 1250.

   Give the 1250 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