Worksheet 762 · Skill 3

Dead reckoning

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1. At 0925 you fix your position 328°T, 2.3 nm from Tern Island tower. You steer 150°T at 6.6 kn until 0935, then 021°T at 5.0 kn until 0945.

   Give the 0945 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 0830 you fix your position 029°T, 3.0 nm from Heron Point Light. You steer 011°T at 4.0 kn until 0840, then 167°T at 9.9 kn until 0855.

   Give the 0855 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 1350 you fix your position 264°T, 2.1 nm from Gannet Rock daybeacon. You steer 278°T at 5.0 kn until 1405, then 074°T at 5.3 kn until 1425.

   Give the 1425 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  

4. At 0815 you fix your position 042°T, 2.8 nm from Tern Island tower. You steer 190°T at 6.9 kn until 0855, then 300°T at 4.0 kn until 0920.

   Give the 0920 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  

5. At 0835 you fix your position 267°T, 0.9 nm from Gannet Rock daybeacon. You steer 016°T at 4.4 kn until 0855, then 244°T at 8.3 kn until 0905.

   Give the 0905 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 1140 you fix your position 047°T, 3.0 nm from Heron Point Light. You steer 069°T at 5.9 kn until 1210, then 221°T at 6.4 kn until 1230.

   Give the 1230 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  

7. At 1225 you fix your position 044°T, 3.1 nm from Heron Point Light. You steer 270°T at 4.9 kn until 1245, then 018°T at 5.8 kn until 1310.

   Give the 1310 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 1250 you fix your position 050°T, 3.4 nm from Heron Point Light. You steer 271°T at 6.2 kn until 1305, then 116°T at 4.6 kn until 1350.

   Give the 1350 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