Worksheet 650 · Skill 3

Dead reckoning

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1. At 1020 you fix your position 072°T, 4.2 nm from Tern Island tower. You steer 197°T at 6.9 kn until 1030, then 270°T at 4.2 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  

2. At 1000 you fix your position 303°T, 1.7 nm from Tern Island tower. You steer 081°T at 7.3 kn until 1035, then 308°T at 4.8 kn until 1050.

   Give the 1050 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 1055 you fix your position 225°T, 2.7 nm from Tern Island tower. You steer 179°T at 4.5 kn until 1120, then 308°T at 4.1 kn until 1140.

   Give the 1140 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 1025 you fix your position 286°T, 1.6 nm from Tern Island tower. You steer 189°T at 4.7 kn until 1050, then 320°T at 5.8 kn until 1105.

   Give the 1105 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 1400 you fix your position 255°T, 3.3 nm from Tern Island tower. You steer 045°T at 4.5 kn until 1430, then 266°T at 6.3 kn until 1455.

   Give the 1455 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  

6. At 1500 you fix your position 065°T, 1.5 nm from Westfield church spire. You steer 143°T at 7.4 kn until 1535, then 111°T at 9.8 kn until 1545.

   Give the 1545 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  

7. At 1110 you fix your position 279°T, 3.5 nm from Tern Island tower. You steer 138°T at 6.0 kn until 1140, then 267°T at 4.5 kn until 1220.

   Give the 1220 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 1350 you fix your position 213°T, 3.1 nm from Tern Island tower. You steer 224°T at 6.0 kn until 1400, then 153°T at 7.4 kn until 1410.

   Give the 1410 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