Worksheet 563 · Skill 3

Dead reckoning

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1. At 1020 you fix your position 306°T, 3.1 nm from Tern Island tower. You steer 173°T at 6.3 kn until 1050, then 355°T at 7.3 kn until 1105.

   Give the 1105 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 1200 you fix your position 074°T, 2.9 nm from Tern Island tower. You steer 274°T at 8.2 kn until 1215, then 124°T at 5.2 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  

3. At 0700 you fix your position 045°T, 1.1 nm from Westfield church spire. You steer 334°T at 9.8 kn until 0710, then 082°T at 7.3 kn until 0735.

   Give the 0735 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 1110 you fix your position 018°T, 1.5 nm from Heron Point Light. You steer 223°T at 5.3 kn until 1120, then 040°T at 4.6 kn until 1155.

   Give the 1155 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 0815 you fix your position 258°T, 1.4 nm from Gannet Rock daybeacon. You steer 317°T at 9.8 kn until 0855, then 223°T at 5.2 kn until 0905.

   Give the 0905 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 305°T, 3.4 nm from Tern Island tower. You steer 174°T at 7.7 kn until 0810, then 316°T at 5.6 kn until 0825.

   Give the 0825 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 1520 you fix your position 022°T, 2.8 nm from Gannet Rock daybeacon. You steer 153°T at 7.1 kn until 1545, then 185°T at 6.1 kn until 1600.

   Give the 1600 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

8. At 0935 you fix your position 091°T, 2.1 nm from Gannet Rock daybeacon. You steer 189°T at 7.3 kn until 0945, then 281°T at 8.3 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