Worksheet 265 · Skill 3

Dead reckoning

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1. At 0700 you fix your position 062°T, 4.9 nm from Tern Island tower. You steer 157°T at 7.7 kn until 0715, then 284°T at 8.4 kn until 0725.

   Give the 0725 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 1125 you fix your position 022°T, 1.6 nm from Heron Point Light. You steer 011°T at 6.6 kn until 1200, then 177°T at 4.9 kn until 1210.

   Give the 1210 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 0805 you fix your position 008°T, 1.5 nm from Tern Island tower. You steer 130°T at 7.3 kn until 0840, then 014°T at 4.8 kn until 0915.

   Give the 0915 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 0725 you fix your position 041°T, 4.4 nm from Gannet Rock daybeacon. You steer 193°T at 6.8 kn until 0810, then 017°T at 5.5 kn until 0830.

   Give the 0830 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  

5. At 0700 you fix your position 045°T, 1.7 nm from Tern Island tower. You steer 109°T at 5.8 kn until 0725, then 153°T at 4.5 kn until 0740.

   Give the 0740 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  

6. At 0725 you fix your position 201°T, 1.9 nm from Tern Island tower. You steer 283°T at 4.5 kn until 0810, then 251°T at 7.3 kn until 0825.

   Give the 0825 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 0835 you fix your position 044°T, 4.6 nm from Westfield church spire. You steer 173°T at 8.8 kn until 0850, then 210°T at 6.4 kn until 0905.

   Give the 0905 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 1320 you fix your position 335°T, 2.5 nm from Tern Island tower. You steer 221°T at 9.4 kn until 1400, then 107°T at 4.2 kn until 1415.

   Give the 1415 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