Worksheet 335 · Skill 3

Dead reckoning

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1. At 1435 you fix your position 255°T, 2.3 nm from Gannet Rock daybeacon. You steer 303°T at 6.0 kn until 1520, then 126°T at 5.5 kn until 1545.

   Give the 1545 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 1245 you fix your position 284°T, 3.2 nm from Tern Island tower. You steer 227°T at 9.1 kn until 1310, then 354°T at 5.2 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  

3. At 1535 you fix your position 244°T, 2.7 nm from Gannet Rock daybeacon. You steer 270°T at 6.4 kn until 1600, then 181°T at 5.0 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  

4. At 1000 you fix your position 207°T, 1.4 nm from Gannet Rock daybeacon. You steer 008°T at 4.3 kn until 1045, then 133°T at 5.1 kn until 1100.

   Give the 1100 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  

5. At 1505 you fix your position 088°T, 3.4 nm from Westfield church spire. You steer 323°T at 8.5 kn until 1515, then 179°T at 8.9 kn until 1530.

   Give the 1530 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 1255 you fix your position 054°T, 2.8 nm from Heron Point Light. You steer 263°T at 8.4 kn until 1315, then 030°T at 9.7 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  

7. At 1430 you fix your position 009°T, 2.3 nm from Tern Island tower. You steer 107°T at 8.3 kn until 1455, then 167°T at 5.5 kn until 1535.

   Give the 1535 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 0740 you fix your position 032°T, 1.9 nm from Gannet Rock daybeacon. You steer 270°T at 4.3 kn until 0800, then 117°T at 5.0 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