Worksheet 480 · Skill 3

Dead reckoning

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1. At 1330 you fix your position 237°T, 2.8 nm from Tern Island tower. You steer 136°T at 8.9 kn until 1400, then 261°T at 9.2 kn until 1410.

   Give the 1410 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  

2. At 1105 you fix your position 128°T, 1.8 nm from Westfield church spire. You steer 112°T at 8.9 kn until 1145, then 003°T at 6.2 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  

3. At 1510 you fix your position 207°T, 1.9 nm from Tern Island tower. You steer 294°T at 4.1 kn until 1525, then 127°T at 8.7 kn until 1555.

   Give the 1555 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 1245 you fix your position 312°T, 2.5 nm from Tern Island tower. You steer 099°T at 7.0 kn until 1330, then 212°T at 4.5 kn until 1405.

   Give the 1405 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 1235 you fix your position 280°T, 3.1 nm from Tern Island tower. You steer 169°T at 7.7 kn until 1315, then 104°T at 7.4 kn until 1335.

   Give the 1335 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 0730 you fix your position 203°T, 1.9 nm from Gannet Rock daybeacon. You steer 245°T at 7.1 kn until 0740, then 323°T at 4.3 kn until 0810.

   Give the 0810 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 0705 you fix your position 132°T, 1.7 nm from Westfield church spire. You steer 056°T at 6.3 kn until 0740, then 091°T at 9.0 kn until 0750.

   Give the 0750 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 1440 you fix your position 040°T, 1.2 nm from Gannet Rock daybeacon. You steer 081°T at 7.0 kn until 1450, then 179°T at 4.5 kn until 1515.

   Give the 1515 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