Worksheet 350 · Skill 3

Dead reckoning

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1. At 0715 you fix your position 249°T, 2.1 nm from Gannet Rock daybeacon. You steer 285°T at 4.2 kn until 0735, then 100°T at 6.1 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  

2. At 0905 you fix your position 282°T, 3.0 nm from Tern Island tower. You steer 147°T at 5.2 kn until 0940, then 301°T at 5.6 kn until 1020.

   Give the 1020 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 1035 you fix your position 026°T, 3.3 nm from Heron Point Light. You steer 011°T at 8.3 kn until 1055, then 275°T at 6.3 kn until 1130.

   Give the 1130 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 1405 you fix your position 270°T, 3.1 nm from Tern Island tower. You steer 131°T at 8.6 kn until 1445, then 309°T at 9.8 kn until 1530.

   Give the 1530 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  

5. At 1020 you fix your position 258°T, 2.9 nm from Gannet Rock daybeacon. You steer 098°T at 6.0 kn until 1105, then 288°T at 5.8 kn until 1150.

   Give the 1150 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  

6. At 1145 you fix your position 010°T, 1.2 nm from Gannet Rock daybeacon. You steer 226°T at 4.1 kn until 1205, then 297°T at 7.9 kn until 1230.

   Give the 1230 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 1215 you fix your position 294°T, 1.7 nm from Gannet Rock daybeacon. You steer 073°T at 9.6 kn until 1230, then 240°T at 7.2 kn until 1245.

   Give the 1245 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 1000 you fix your position 210°T, 1.7 nm from Tern Island tower. You steer 169°T at 5.6 kn until 1040, then 026°T at 5.3 kn until 1050.

   Give the 1050 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