Worksheet 11 · Skill 3

Dead reckoning

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1. At 1105 you fix your position 241°T, 2.9 nm from Tern Island tower. You steer 235°T at 4.9 kn until 1115, then 041°T at 5.9 kn until 1150.

   Give the 1150 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 0800 you fix your position 065°T, 1.4 nm from Westfield church spire. You steer 080°T at 4.3 kn until 0845, then 200°T at 6.0 kn until 0855.

   Give the 0855 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 1250 you fix your position 238°T, 1.4 nm from Tern Island tower. You steer 284°T at 8.0 kn until 1320, then 195°T at 6.4 kn until 1355.

   Give the 1355 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  

4. At 1050 you fix your position 086°T, 3.0 nm from Gannet Rock daybeacon. You steer 217°T at 6.2 kn until 1105, then 328°T at 6.2 kn until 1140.

   Give the 1140 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 1050 you fix your position 077°T, 3.4 nm from Westfield church spire. You steer 009°T at 5.7 kn until 1105, then 081°T at 6.5 kn until 1145.

   Give the 1145 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 0845 you fix your position 257°T, 3.3 nm from Tern Island tower. You steer 052°T at 5.0 kn until 0855, then 306°T at 8.8 kn until 0915.

   Give the 0915 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 1430 you fix your position 307°T, 2.1 nm from Tern Island tower. You steer 229°T at 7.4 kn until 1500, then 177°T at 5.9 kn until 1525.

   Give the 1525 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  

8. At 1510 you fix your position 030°T, 2.9 nm from Westfield church spire. You steer 121°T at 9.4 kn until 1550, then 274°T at 7.4 kn until 1615.

   Give the 1615 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