Worksheet 240 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 100°T, 1.2 nm from Westfield church spire. You steer 137°T at 7.1 kn until 1350, then 282°T at 7.4 kn until 1405.

   Give the 1405 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 1130 you fix your position 297°T, 1.0 nm from Gannet Rock daybeacon. You steer 060°T at 4.9 kn until 1140, then 115°T at 7.7 kn until 1205.

   Give the 1205 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 1055 you fix your position 097°T, 2.2 nm from Westfield church spire. You steer 057°T at 8.4 kn until 1105, then 177°T at 7.2 kn until 1140.

   Give the 1140 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 1505 you fix your position 028°T, 2.7 nm from Gannet Rock daybeacon. You steer 173°T at 5.7 kn until 1535, then 011°T at 6.8 kn until 1620.

   Give the 1620 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 1530 you fix your position 061°T, 3.6 nm from Westfield church spire. You steer 214°T at 7.0 kn until 1540, then 068°T at 7.5 kn until 1555.

   Give the 1555 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 1445 you fix your position 238°T, 3.2 nm from Tern Island tower. You steer 227°T at 5.6 kn until 1505, then 312°T at 5.4 kn until 1535.

   Give the 1535 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 1005 you fix your position 327°T, 2.5 nm from Tern Island tower. You steer 143°T at 4.1 kn until 1025, then 239°T at 9.9 kn until 1035.

   Give the 1035 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  

8. At 0850 you fix your position 005°T, 1.7 nm from Heron Point Light. You steer 155°T at 7.8 kn until 0900, then 349°T at 5.2 kn until 0945.

   Give the 0945 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