Worksheet 212 · Skill 3

Dead reckoning

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1. At 0920 you fix your position 297°T, 3.5 nm from Tern Island tower. You steer 269°T at 8.3 kn until 0930, then 114°T at 5.3 kn until 1010.

   Give the 1010 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 1030 you fix your position 074°T, 2.0 nm from Gannet Rock daybeacon. You steer 019°T at 6.5 kn until 1105, then 186°T at 5.1 kn until 1135.

   Give the 1135 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 0820 you fix your position 022°T, 1.9 nm from Heron Point Light. You steer 053°T at 6.9 kn until 0845, then 346°T at 6.2 kn until 0915.

   Give the 0915 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 1530 you fix your position 220°T, 1.5 nm from Gannet Rock daybeacon. You steer 136°T at 4.7 kn until 1545, then 042°T at 7.1 kn until 1605.

   Give the 1605 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 1445 you fix your position 266°T, 3.7 nm from Tern Island tower. You steer 333°T at 4.2 kn until 1510, then 176°T at 4.6 kn until 1520.

   Give the 1520 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 0725 you fix your position 290°T, 2.9 nm from Tern Island tower. You steer 238°T at 7.9 kn until 0735, then 150°T at 6.6 kn until 0800.

   Give the 0800 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 1415 you fix your position 240°T, 2.2 nm from Tern Island tower. You steer 152°T at 6.6 kn until 1440, then 310°T at 6.4 kn until 1510.

   Give the 1510 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  

8. At 0850 you fix your position 255°T, 3.4 nm from Tern Island tower. You steer 297°T at 9.1 kn until 0915, then 051°T at 8.0 kn until 0925.

   Give the 0925 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