Worksheet 177 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 270°T, 3.3 nm from Tern Island tower. You steer 068°T at 8.0 kn until 1255, then 255°T at 6.8 kn until 1325.

   Give the 1325 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 1240 you fix your position 207°T, 1.8 nm from Tern Island tower. You steer 067°T at 9.4 kn until 1250, then 114°T at 9.9 kn until 1300.

   Give the 1300 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  

3. At 1355 you fix your position 256°T, 3.2 nm from Tern Island tower. You steer 167°T at 9.8 kn until 1415, then 116°T at 5.1 kn until 1445.

   Give the 1445 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  

4. At 0815 you fix your position 035°T, 2.5 nm from Tern Island tower. You steer 271°T at 8.3 kn until 0855, then 217°T at 7.3 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  

5. At 1105 you fix your position 339°T, 0.9 nm from Gannet Rock daybeacon. You steer 128°T at 6.8 kn until 1120, then 350°T at 8.8 kn until 1150.

   Give the 1150 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 1520 you fix your position 086°T, 2.2 nm from Westfield church spire. You steer 104°T at 7.6 kn until 1540, then 201°T at 7.8 kn until 1600.

   Give the 1600 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 0705 you fix your position 049°T, 2.8 nm from Heron Point Light. You steer 186°T at 4.2 kn until 0735, then 305°T at 9.8 kn until 0745.

   Give the 0745 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  

8. At 1120 you fix your position 290°T, 3.0 nm from Tern Island tower. You steer 228°T at 7.5 kn until 1135, then 150°T at 5.6 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