Worksheet 508 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 034°T, 2.0 nm from Gannet Rock daybeacon. You steer 239°T at 5.8 kn until 1245, then 062°T at 4.5 kn until 1255.

   Give the 1255 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  

2. At 1455 you fix your position 041°T, 2.1 nm from Gannet Rock daybeacon. You steer 199°T at 9.8 kn until 1520, then 271°T at 5.6 kn until 1550.

   Give the 1550 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 1035 you fix your position 227°T, 2.6 nm from Tern Island tower. You steer 200°T at 9.0 kn until 1045, then 057°T at 9.6 kn until 1055.

   Give the 1055 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 1340 you fix your position 340°T, 1.8 nm from Mill stack. You steer 024°T at 7.5 kn until 1355, then 099°T at 6.1 kn until 1415.

   Give the 1415 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  

5. At 0700 you fix your position 234°T, 1.9 nm from Gannet Rock daybeacon. You steer 276°T at 7.3 kn until 0730, then 316°T at 7.0 kn until 0750.

   Give the 0750 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 1300 you fix your position 211°T, 1.4 nm from Tern Island tower. You steer 137°T at 4.5 kn until 1335, then 294°T at 6.9 kn until 1405.

   Give the 1405 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  

7. At 0800 you fix your position 207°T, 1.9 nm from Gannet Rock daybeacon. You steer 329°T at 9.5 kn until 0835, then 064°T at 7.8 kn until 0845.

   Give the 0845 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 0815 you fix your position 259°T, 2.0 nm from Tern Island tower. You steer 230°T at 6.2 kn until 0825, then 134°T at 4.6 kn until 0850.

   Give the 0850 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