Worksheet 590 · Skill 3

Dead reckoning

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1. At 1450 you fix your position 288°T, 1.5 nm from Gannet Rock daybeacon. You steer 269°T at 5.1 kn until 1525, then 215°T at 4.5 kn until 1555.

   Give the 1555 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  

2. At 0805 you fix your position 032°T, 2.3 nm from Heron Point Light. You steer 342°T at 4.5 kn until 0840, then 054°T at 6.3 kn until 0905.

   Give the 0905 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 0940 you fix your position 338°T, 2.7 nm from Tern Island tower. You steer 228°T at 5.0 kn until 0955, then 083°T at 9.0 kn until 1025.

   Give the 1025 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 1435 you fix your position 026°T, 3.4 nm from Westfield church spire. You steer 142°T at 9.2 kn until 1445, then 009°T at 5.8 kn until 1455.

   Give the 1455 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 1335 you fix your position 196°T, 1.2 nm from Tern Island tower. You steer 163°T at 7.2 kn until 1350, then 044°T at 6.3 kn until 1415.

   Give the 1415 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 1210 you fix your position 331°T, 1.3 nm from Gannet Rock daybeacon. You steer 273°T at 4.6 kn until 1230, then 079°T at 8.4 kn until 1245.

   Give the 1245 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  

7. At 1425 you fix your position 336°T, 2.4 nm from Mill stack. You steer 033°T at 7.4 kn until 1445, then 272°T at 6.8 kn until 1530.

   Give the 1530 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 0810 you fix your position 011°T, 2.9 nm from Mill stack. You steer 065°T at 4.3 kn until 0830, then 289°T at 9.2 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