Worksheet 260 · Skill 3

Dead reckoning

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1. At 1530 you fix your position 354°T, 1.5 nm from Gannet Rock daybeacon. You steer 152°T at 9.8 kn until 1555, then 292°T at 9.5 kn until 1640.

   Give the 1640 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  

2. At 1545 you fix your position 057°T, 3.3 nm from Tern Island tower. You steer 197°T at 7.0 kn until 1620, then 288°T at 7.6 kn until 1650.

   Give the 1650 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 1245 you fix your position 237°T, 3.2 nm from Tern Island tower. You steer 252°T at 6.6 kn until 1305, then 026°T at 8.4 kn until 1315.

   Give the 1315 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 1130 you fix your position 083°T, 3.3 nm from Westfield church spire. You steer 317°T at 8.5 kn until 1145, then 082°T at 6.8 kn until 1215.

   Give the 1215 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 1520 you fix your position 309°T, 1.6 nm from Tern Island tower. You steer 183°T at 8.8 kn until 1540, then 294°T at 5.6 kn until 1615.

   Give the 1615 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 1335 you fix your position 037°T, 3.8 nm from Gannet Rock daybeacon. You steer 259°T at 6.3 kn until 1400, then 154°T at 5.4 kn until 1435.

   Give the 1435 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  

7. At 0735 you fix your position 109°T, 2.2 nm from Westfield church spire. You steer 074°T at 5.2 kn until 0820, then 201°T at 6.4 kn until 0850.

   Give the 0850 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  

8. At 0840 you fix your position 028°T, 2.5 nm from Heron Point Light. You steer 123°T at 5.0 kn until 0855, then 003°T at 10.0 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