Worksheet 102 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 025°T, 2.6 nm from Gannet Rock daybeacon. You steer 164°T at 10.0 kn until 0825, then 300°T at 6.7 kn until 0840.

   Give the 0840 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  

2. At 0945 you fix your position 071°T, 4.9 nm from Tern Island tower. You steer 225°T at 9.2 kn until 1020, then 050°T at 5.6 kn until 1040.

   Give the 1040 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 1450 you fix your position 252°T, 3.0 nm from Tern Island tower. You steer 326°T at 5.1 kn until 1530, then 203°T at 7.9 kn until 1605.

   Give the 1605 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  

4. At 1020 you fix your position 303°T, 2.2 nm from Tern Island tower. You steer 240°T at 5.1 kn until 1045, then 173°T at 5.3 kn until 1115.

   Give the 1115 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  

5. At 0755 you fix your position 221°T, 2.2 nm from Gannet Rock daybeacon. You steer 256°T at 7.0 kn until 0810, then 289°T at 8.3 kn until 0835.

   Give the 0835 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  

6. At 1355 you fix your position 119°T, 1.8 nm from Westfield church spire. You steer 100°T at 7.2 kn until 1415, then 301°T at 8.4 kn until 1435.

   Give the 1435 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 1345 you fix your position 026°T, 3.6 nm from Westfield church spire. You steer 123°T at 5.1 kn until 1400, then 319°T at 4.7 kn until 1415.

   Give the 1415 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  

8. At 0730 you fix your position 221°T, 3.4 nm from Tern Island tower. You steer 113°T at 7.1 kn until 0810, then 328°T at 5.4 kn until 0850.

   Give the 0850 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