Worksheet 201 · Skill 3

Dead reckoning

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1. At 0935 you fix your position 031°T, 3.2 nm from Gannet Rock daybeacon. You steer 314°T at 9.8 kn until 0950, then 261°T at 8.6 kn until 1000.

   Give the 1000 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 1150 you fix your position 117°T, 1.0 nm from Gannet Rock daybeacon. You steer 036°T at 5.5 kn until 1220, then 348°T at 5.9 kn until 1235.

   Give the 1235 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  

3. At 1050 you fix your position 052°T, 2.8 nm from Heron Point Light. You steer 030°T at 7.3 kn until 1110, then 284°T at 7.8 kn until 1145.

   Give the 1145 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  

4. At 0745 you fix your position 185°T, 1.8 nm from Tern Island tower. You steer 183°T at 5.2 kn until 0810, then 114°T at 8.4 kn until 0820.

   Give the 0820 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 0745 you fix your position 015°T, 2.3 nm from Westfield church spire. You steer 077°T at 6.7 kn until 0800, then 339°T at 4.4 kn until 0810.

   Give the 0810 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 1420 you fix your position 257°T, 1.5 nm from Gannet Rock daybeacon. You steer 222°T at 4.8 kn until 1440, then 325°T at 8.1 kn until 1500.

   Give the 1500 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 237°T, 1.8 nm from Tern Island tower. You steer 171°T at 4.7 kn until 1535, then 075°T at 9.4 kn until 1545.

   Give the 1545 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 0935 you fix your position 356°T, 1.2 nm from Gannet Rock daybeacon. You steer 264°T at 7.2 kn until 1015, then 059°T at 8.4 kn until 1030.

   Give the 1030 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