Worksheet 254 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 309°T, 2.4 nm from Tern Island tower. You steer 321°T at 5.0 kn until 0800, then 113°T at 4.9 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  

2. At 1215 you fix your position 255°T, 3.6 nm from Tern Island tower. You steer 253°T at 7.2 kn until 1245, then 139°T at 4.9 kn until 1310.

   Give the 1310 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  

3. At 0940 you fix your position 237°T, 2.1 nm from Gannet Rock daybeacon. You steer 358°T at 9.3 kn until 0950, then 322°T at 9.5 kn until 1005.

   Give the 1005 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 1030 you fix your position 063°T, 2.2 nm from Westfield church spire. You steer 195°T at 9.9 kn until 1045, then 128°T at 6.7 kn until 1105.

   Give the 1105 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  

5. At 1510 you fix your position 044°T, 3.9 nm from Gannet Rock daybeacon. You steer 216°T at 9.5 kn until 1525, then 317°T at 5.0 kn until 1535.

   Give the 1535 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  

6. At 0915 you fix your position 280°T, 3.3 nm from Tern Island tower. You steer 079°T at 8.2 kn until 0945, then 284°T at 5.7 kn until 1025.

   Give the 1025 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 1130 you fix your position 209°T, 2.9 nm from Tern Island tower. You steer 355°T at 6.0 kn until 1155, then 166°T at 8.0 kn until 1235.

   Give the 1235 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  

8. At 1005 you fix your position 133°T, 3.0 nm from Tern Island tower. You steer 047°T at 7.5 kn until 1035, then 186°T at 6.2 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