Worksheet 712 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 154°T, 3.2 nm from Tern Island tower. You steer 252°T at 6.6 kn until 1445, then 319°T at 9.5 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  

2. At 1425 you fix your position 056°T, 3.5 nm from Heron Point Light. You steer 109°T at 5.3 kn until 1450, then 343°T at 6.2 kn until 1530.

   Give the 1530 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 1040 you fix your position 251°T, 2.8 nm from Gannet Rock daybeacon. You steer 087°T at 7.8 kn until 1125, then 357°T at 5.5 kn until 1135.

   Give the 1135 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  

4. At 1340 you fix your position 225°T, 1.4 nm from Gannet Rock daybeacon. You steer 116°T at 9.6 kn until 1350, then 285°T at 7.0 kn until 1425.

   Give the 1425 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  

5. At 1410 you fix your position 016°T, 2.1 nm from Kittle water tank. You steer 224°T at 5.3 kn until 1420, then 024°T at 9.6 kn until 1435.

   Give the 1435 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 1445 you fix your position 062°T, 3.3 nm from Westfield church spire. You steer 031°T at 4.3 kn until 1510, then 260°T at 5.3 kn until 1545.

   Give the 1545 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 0805 you fix your position 056°T, 2.4 nm from Gannet Rock daybeacon. You steer 209°T at 9.4 kn until 0815, then 142°T at 9.8 kn until 0830.

   Give the 0830 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

8. At 1045 you fix your position 204°T, 3.0 nm from Tern Island tower. You steer 272°T at 6.5 kn until 1105, then 113°T at 7.3 kn until 1125.

   Give the 1125 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