Worksheet 237 · Skill 3

Dead reckoning

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1. At 1350 you fix your position 257°T, 3.3 nm from Tern Island tower. You steer 310°T at 7.6 kn until 1410, then 075°T at 9.9 kn until 1440.

   Give the 1440 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 1135 you fix your position 253°T, 1.2 nm from Gannet Rock daybeacon. You steer 305°T at 5.3 kn until 1205, then 171°T at 4.9 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  

3. At 0900 you fix your position 269°T, 1.8 nm from Tern Island tower. You steer 280°T at 7.7 kn until 0930, then 170°T at 4.4 kn until 0945.

   Give the 0945 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 1050 you fix your position 091°T, 3.5 nm from Westfield church spire. You steer 168°T at 7.0 kn until 1115, then 289°T at 8.1 kn until 1130.

   Give the 1130 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 1410 you fix your position 073°T, 3.7 nm from Westfield church spire. You steer 241°T at 5.1 kn until 1440, then 097°T at 10.0 kn until 1525.

   Give the 1525 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  

6. At 1505 you fix your position 010°T, 2.7 nm from Mill stack. You steer 307°T at 7.6 kn until 1530, then 242°T at 6.4 kn until 1540.

   Give the 1540 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 0740 you fix your position 024°T, 2.3 nm from Tern Island tower. You steer 253°T at 4.9 kn until 0820, then 297°T at 4.8 kn until 0900.

   Give the 0900 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  

8. At 0835 you fix your position 012°T, 3.4 nm from Westfield church spire. You steer 123°T at 8.8 kn until 0850, then 165°T at 5.7 kn until 0925.

   Give the 0925 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