Worksheet 511 · Skill 3

Dead reckoning

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1. At 1315 you fix your position 055°T, 2.4 nm from Tern Island tower. You steer 290°T at 6.6 kn until 1340, then 224°T at 6.9 kn until 1355.

   Give the 1355 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 1405 you fix your position 003°T, 3.6 nm from Westfield church spire. You steer 103°T at 4.5 kn until 1435, then 228°T at 5.1 kn until 1450.

   Give the 1450 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 0825 you fix your position 261°T, 2.4 nm from Gannet Rock daybeacon. You steer 290°T at 9.3 kn until 0900, then 152°T at 6.7 kn until 0915.

   Give the 0915 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 1330 you fix your position 061°T, 4.0 nm from Tern Island tower. You steer 212°T at 7.6 kn until 1345, then 172°T at 4.5 kn until 1430.

   Give the 1430 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 1555 you fix your position 096°T, 1.2 nm from Westfield church spire. You steer 160°T at 8.8 kn until 1610, then 130°T at 8.1 kn until 1625.

   Give the 1625 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  

6. At 1505 you fix your position 301°T, 2.8 nm from Tern Island tower. You steer 173°T at 9.1 kn until 1515, then 204°T at 6.0 kn until 1540.

   Give the 1540 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  

7. At 0810 you fix your position 280°T, 3.2 nm from Tern Island tower. You steer 147°T at 9.0 kn until 0835, then 101°T at 8.1 kn until 0850.

   Give the 0850 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  

8. At 1500 you fix your position 025°T, 2.5 nm from Heron Point Light. You steer 029°T at 6.9 kn until 1525, then 154°T at 4.9 kn until 1540.

   Give the 1540 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