Worksheet 209 · Skill 3

Dead reckoning

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1. At 1005 you fix your position 011°T, 1.5 nm from Gannet Rock daybeacon. You steer 062°T at 5.5 kn until 1035, then 299°T at 7.9 kn until 1050.

   Give the 1050 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 0740 you fix your position 203°T, 2.9 nm from Tern Island tower. You steer 104°T at 4.6 kn until 0750, then 052°T at 5.2 kn until 0825.

   Give the 0825 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 0825 you fix your position 348°T, 2.8 nm from Mill stack. You steer 056°T at 5.7 kn until 0855, then 235°T at 5.5 kn until 0905.

   Give the 0905 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 1510 you fix your position 082°T, 2.1 nm from Westfield church spire. You steer 119°T at 6.3 kn until 1530, then 042°T at 7.2 kn until 1555.

   Give the 1555 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 1305 you fix your position 256°T, 2.8 nm from Tern Island tower. You steer 064°T at 4.0 kn until 1315, then 320°T at 4.1 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  

6. At 0930 you fix your position 050°T, 3.2 nm from Gannet Rock daybeacon. You steer 230°T at 5.3 kn until 0955, then 164°T at 6.5 kn until 1015.

   Give the 1015 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

7. At 1045 you fix your position 013°T, 1.6 nm from Gannet Rock daybeacon. You steer 223°T at 7.2 kn until 1100, then 057°T at 5.7 kn until 1120.

   Give the 1120 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  

8. At 1145 you fix your position 090°T, 2.1 nm from Heron Point Light. You steer 024°T at 7.3 kn until 1230, then 289°T at 4.7 kn until 1305.

   Give the 1305 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