Worksheet 615 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 298°T, 3.5 nm from Tern Island tower. You steer 142°T at 4.2 kn until 1115, then 283°T at 4.5 kn until 1125.

   Give the 1125 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 0720 you fix your position 036°T, 2.3 nm from Kittle water tank. You steer 325°T at 8.4 kn until 0740, then 023°T at 6.6 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  

3. At 1340 you fix your position 348°T, 2.7 nm from Mill stack. You steer 238°T at 5.9 kn until 1350, then 334°T at 4.7 kn until 1435.

   Give the 1435 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 1040 you fix your position 055°T, 3.3 nm from Heron Point Light. You steer 037°T at 9.6 kn until 1055, then 186°T at 9.1 kn until 1110.

   Give the 1110 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  

5. At 0930 you fix your position 028°T, 3.6 nm from Westfield church spire. You steer 229°T at 6.7 kn until 0940, then 067°T at 4.1 kn until 1005.

   Give the 1005 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 0855 you fix your position 204°T, 2.9 nm from Tern Island tower. You steer 286°T at 7.0 kn until 0935, then 065°T at 9.5 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  

7. At 0810 you fix your position 315°T, 2.8 nm from Tern Island tower. You steer 225°T at 9.9 kn until 0825, then 161°T at 9.4 kn until 0840.

   Give the 0840 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 0720 you fix your position 027°T, 3.0 nm from Gannet Rock daybeacon. You steer 304°T at 5.4 kn until 0750, then 160°T at 5.0 kn until 0810.

   Give the 0810 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