Worksheet 365 · Skill 3

Dead reckoning

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1. At 1530 you fix your position 086°T, 3.6 nm from Westfield church spire. You steer 096°T at 6.7 kn until 1540, then 348°T at 9.1 kn until 1600.

   Give the 1600 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 0705 you fix your position 078°T, 3.2 nm from Tern Island tower. You steer 297°T at 9.1 kn until 0715, then 255°T at 9.2 kn until 0725.

   Give the 0725 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 0725 you fix your position 075°T, 1.7 nm from Heron Point Light. You steer 009°T at 6.2 kn until 0755, then 139°T at 4.4 kn until 0815.

   Give the 0815 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 0925 you fix your position 000°T, 1.7 nm from Heron Point Light. You steer 042°T at 4.6 kn until 0940, then 008°T at 9.9 kn until 0950.

   Give the 0950 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 0945 you fix your position 103°T, 2.1 nm from Westfield church spire. You steer 242°T at 7.5 kn until 1000, then 089°T at 4.2 kn until 1040.

   Give the 1040 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 0700 you fix your position 229°T, 1.3 nm from Tern Island tower. You steer 204°T at 5.0 kn until 0730, then 280°T at 5.4 kn until 0740.

   Give the 0740 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  

7. At 1350 you fix your position 089°T, 1.6 nm from Gannet Rock daybeacon. You steer 231°T at 5.7 kn until 1415, then 285°T at 9.7 kn until 1455.

   Give the 1455 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 1255 you fix your position 355°T, 3.0 nm from Mill stack. You steer 290°T at 6.3 kn until 1320, then 142°T at 8.9 kn until 1340.

   Give the 1340 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