Worksheet 665 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 042°T, 4.1 nm from Gannet Rock daybeacon. You steer 196°T at 4.7 kn until 1605, then 003°T at 6.8 kn until 1620.

   Give the 1620 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  

2. At 1350 you fix your position 257°T, 1.1 nm from Gannet Rock daybeacon. You steer 263°T at 7.1 kn until 1435, then 067°T at 10.0 kn until 1445.

   Give the 1445 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  

3. At 0730 you fix your position 357°T, 1.3 nm from Kittle water tank. You steer 025°T at 4.3 kn until 0800, then 331°T at 9.4 kn until 0825.

   Give the 0825 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 0750 you fix your position 161°T, 1.5 nm from Gannet Rock daybeacon. You steer 319°T at 5.5 kn until 0800, then 047°T at 9.7 kn until 0820.

   Give the 0820 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 1535 you fix your position 008°T, 3.4 nm from Westfield church spire. You steer 120°T at 5.3 kn until 1620, then 258°T at 7.1 kn until 1635.

   Give the 1635 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  

6. At 1335 you fix your position 232°T, 1.7 nm from Gannet Rock daybeacon. You steer 288°T at 9.8 kn until 1410, then 044°T at 7.2 kn until 1445.

   Give the 1445 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  

7. At 1550 you fix your position 047°T, 2.4 nm from Heron Point Light. You steer 099°T at 8.2 kn until 1620, then 352°T at 8.8 kn until 1635.

   Give the 1635 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 0835 you fix your position 312°T, 3.2 nm from Tern Island tower. You steer 121°T at 8.0 kn until 0845, then 182°T at 10.0 kn until 0925.

   Give the 0925 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm