Worksheet 297 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 025°T, 3.0 nm from Gannet Rock daybeacon. You steer 105°T at 9.8 kn until 0855, then 327°T at 5.1 kn until 0915.

   Give the 0915 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 1135 you fix your position 087°T, 3.4 nm from Westfield church spire. You steer 171°T at 6.8 kn until 1145, then 002°T at 9.1 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  

3. At 1220 you fix your position 040°T, 2.8 nm from Tern Island tower. You steer 269°T at 8.8 kn until 1300, then 098°T at 5.7 kn until 1345.

   Give the 1345 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 1245 you fix your position 000°T, 2.0 nm from Mill stack. You steer 336°T at 9.2 kn until 1330, then 287°T at 4.8 kn until 1345.

   Give the 1345 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 1500 you fix your position 081°T, 2.0 nm from Gannet Rock daybeacon. You steer 193°T at 5.3 kn until 1510, then 044°T at 5.2 kn until 1535.

   Give the 1535 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  

6. At 0845 you fix your position 042°T, 2.9 nm from Heron Point Light. You steer 100°T at 8.5 kn until 0910, then 260°T at 4.2 kn until 0930.

   Give the 0930 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 1020 you fix your position 049°T, 3.7 nm from Westfield church spire. You steer 203°T at 5.3 kn until 1035, then 145°T at 4.4 kn until 1110.

   Give the 1110 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 1035 you fix your position 314°T, 3.3 nm from Tern Island tower. You steer 182°T at 5.3 kn until 1110, then 003°T at 5.3 kn until 1145.

   Give the 1145 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