Worksheet 777 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 019°T, 2.0 nm from Gannet Rock daybeacon. You steer 221°T at 4.0 kn until 1545, then 254°T at 4.0 kn until 1615.

   Give the 1615 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 1525 you fix your position 043°T, 2.6 nm from Tern Island tower. You steer 264°T at 5.3 kn until 1610, then 084°T at 5.1 kn until 1635.

   Give the 1635 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 0805 you fix your position 093°T, 1.3 nm from Westfield church spire. You steer 020°T at 6.8 kn until 0840, then 116°T at 4.7 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  

4. At 1415 you fix your position 036°T, 1.8 nm from Westfield church spire. You steer 099°T at 7.1 kn until 1425, then 330°T at 5.5 kn until 1450.

   Give the 1450 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 1505 you fix your position 072°T, 3.4 nm from Westfield church spire. You steer 097°T at 7.9 kn until 1520, then 279°T at 5.4 kn until 1530.

   Give the 1530 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 1510 you fix your position 296°T, 3.3 nm from Tern Island tower. You steer 250°T at 7.0 kn until 1545, then 019°T at 7.2 kn until 1555.

   Give the 1555 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 0925 you fix your position 218°T, 1.9 nm from Gannet Rock daybeacon. You steer 061°T at 9.4 kn until 0950, then 129°T at 4.1 kn until 1005.

   Give the 1005 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 1345 you fix your position 193°T, 1.4 nm from Gannet Rock daybeacon. You steer 258°T at 5.3 kn until 1410, then 296°T at 9.4 kn until 1435.

   Give the 1435 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