Worksheet 521 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 005°T, 2.6 nm from Westfield church spire. You steer 130°T at 5.4 kn until 1405, then 331°T at 4.9 kn until 1425.

   Give the 1425 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 1515 you fix your position 041°T, 2.7 nm from Tern Island tower. You steer 164°T at 7.3 kn until 1535, then 088°T at 4.6 kn until 1605.

   Give the 1605 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 032°T, 3.6 nm from Gannet Rock daybeacon. You steer 218°T at 7.0 kn until 0840, then 250°T at 5.0 kn until 0925.

   Give the 0925 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 1235 you fix your position 007°T, 2.7 nm from Westfield church spire. You steer 156°T at 5.1 kn until 1320, then 005°T at 8.3 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  

5. At 0715 you fix your position 015°T, 1.7 nm from Heron Point Light. You steer 145°T at 4.1 kn until 0725, then 080°T at 4.1 kn until 0735.

   Give the 0735 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 0835 you fix your position 260°T, 3.1 nm from Tern Island tower. You steer 259°T at 5.7 kn until 0905, then 092°T at 7.6 kn until 0920.

   Give the 0920 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 1435 you fix your position 301°T, 4.4 nm from Tern Island tower. You steer 100°T at 10.0 kn until 1515, then 162°T at 5.9 kn until 1535.

   Give the 1535 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 1320 you fix your position 005°T, 3.0 nm from Mill stack. You steer 070°T at 8.3 kn until 1335, then 297°T at 7.3 kn until 1400.

   Give the 1400 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