Worksheet 301 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 264°T, 3.3 nm from Tern Island tower. You steer 038°T at 5.4 kn until 1125, then 259°T at 8.2 kn until 1205.

   Give the 1205 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  

2. At 1145 you fix your position 011°T, 3.1 nm from Westfield church spire. You steer 141°T at 10.0 kn until 1210, then 055°T at 8.2 kn until 1235.

   Give the 1235 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 1505 you fix your position 320°T, 2.9 nm from Tern Island tower. You steer 208°T at 4.8 kn until 1535, then 141°T at 8.4 kn until 1600.

   Give the 1600 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 0725 you fix your position 044°T, 2.5 nm from Heron Point Light. You steer 306°T at 5.0 kn until 0740, then 019°T at 6.7 kn until 0805.

   Give the 0805 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 1140 you fix your position 261°T, 1.9 nm from Tern Island tower. You steer 291°T at 7.9 kn until 1210, then 151°T at 7.0 kn until 1225.

   Give the 1225 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 1245 you fix your position 022°T, 2.4 nm from Mill stack. You steer 305°T at 8.1 kn until 1320, then 339°T at 7.1 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  

7. At 1130 you fix your position 282°T, 3.8 nm from Tern Island tower. You steer 215°T at 4.4 kn until 1155, then 088°T at 6.4 kn until 1225.

   Give the 1225 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 0855 you fix your position 108°T, 1.7 nm from Gannet Rock daybeacon. You steer 254°T at 8.4 kn until 0930, then 326°T at 5.3 kn until 1000.

   Give the 1000 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