Worksheet 305 · Skill 3

Dead reckoning

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1. At 1000 you fix your position 249°T, 3.1 nm from Tern Island tower. You steer 098°T at 6.6 kn until 1010, then 346°T at 5.4 kn until 1035.

   Give the 1035 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 1305 you fix your position 154°T, 1.6 nm from Westfield church spire. You steer 075°T at 6.1 kn until 1325, then 159°T at 4.9 kn until 1335.

   Give the 1335 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 1055 you fix your position 256°T, 2.8 nm from Gannet Rock daybeacon. You steer 334°T at 4.2 kn until 1140, then 048°T at 9.7 kn until 1200.

   Give the 1200 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 0855 you fix your position 094°T, 3.3 nm from Westfield church spire. You steer 074°T at 8.2 kn until 0915, then 218°T at 8.0 kn until 0925.

   Give the 0925 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 1045 you fix your position 231°T, 1.7 nm from Gannet Rock daybeacon. You steer 075°T at 4.1 kn until 1120, then 257°T at 8.0 kn until 1150.

   Give the 1150 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  

6. At 1035 you fix your position 059°T, 2.2 nm from Tern Island tower. You steer 196°T at 7.6 kn until 1120, then 235°T at 5.0 kn until 1135.

   Give the 1135 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 1510 you fix your position 025°T, 3.0 nm from Heron Point Light. You steer 288°T at 6.3 kn until 1520, then 033°T at 6.6 kn until 1555.

   Give the 1555 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  

8. At 0805 you fix your position 265°T, 1.9 nm from Gannet Rock daybeacon. You steer 282°T at 5.8 kn until 0815, then 338°T at 4.0 kn until 0825.

   Give the 0825 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