Worksheet 63 · Skill 3

Dead reckoning

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1. At 0805 you fix your position 235°T, 3.4 nm from Tern Island tower. You steer 048°T at 6.5 kn until 0815, then 287°T at 4.4 kn until 0835.

   Give the 0835 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 1415 you fix your position 057°T, 2.8 nm from Westfield church spire. You steer 054°T at 6.7 kn until 1425, then 304°T at 7.0 kn until 1440.

   Give the 1440 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  

3. At 1000 you fix your position 263°T, 3.4 nm from Tern Island tower. You steer 040°T at 8.5 kn until 1020, then 211°T at 7.0 kn until 1045.

   Give the 1045 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 1455 you fix your position 057°T, 3.5 nm from Heron Point Light. You steer 343°T at 6.8 kn until 1540, then 264°T at 4.6 kn until 1610.

   Give the 1610 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 1055 you fix your position 031°T, 3.4 nm from Gannet Rock daybeacon. You steer 215°T at 6.3 kn until 1105, then 323°T at 5.5 kn until 1120.

   Give the 1120 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 1140 you fix your position 226°T, 2.4 nm from Tern Island tower. You steer 292°T at 7.9 kn until 1220, then 070°T at 7.1 kn until 1230.

   Give the 1230 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  

7. At 1055 you fix your position 034°T, 2.7 nm from Heron Point Light. You steer 008°T at 5.9 kn until 1125, then 149°T at 9.2 kn until 1150.

   Give the 1150 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 0745 you fix your position 355°T, 2.4 nm from Mill stack. You steer 320°T at 9.8 kn until 0805, then 143°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