Worksheet 66 · Skill 3

Dead reckoning

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1. At 1420 you fix your position 031°T, 3.2 nm from Westfield church spire. You steer 165°T at 8.3 kn until 1500, then 278°T at 5.4 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  

2. At 1235 you fix your position 237°T, 3.1 nm from Tern Island tower. You steer 133°T at 5.0 kn until 1255, then 269°T at 4.9 kn until 1310.

   Give the 1310 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  

3. At 1530 you fix your position 358°T, 1.5 nm from Gannet Rock daybeacon. You steer 065°T at 6.8 kn until 1540, then 035°T at 6.4 kn until 1555.

   Give the 1555 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 1230 you fix your position 127°T, 1.6 nm from Gannet Rock daybeacon. You steer 357°T at 7.8 kn until 1310, then 195°T at 5.9 kn until 1325.

   Give the 1325 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 1305 you fix your position 261°T, 3.2 nm from Gannet Rock daybeacon. You steer 168°T at 4.1 kn until 1320, then 269°T at 6.7 kn until 1335.

   Give the 1335 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 0945 you fix your position 029°T, 3.0 nm from Heron Point Light. You steer 146°T at 4.3 kn until 1000, then 090°T at 8.5 kn until 1025.

   Give the 1025 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 0745 you fix your position 010°T, 3.5 nm from Westfield church spire. You steer 191°T at 6.3 kn until 0805, then 137°T at 5.5 kn until 0835.

   Give the 0835 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 0820 you fix your position 357°T, 2.9 nm from Mill stack. You steer 320°T at 4.6 kn until 0855, then 195°T at 5.4 kn until 0915.

   Give the 0915 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