Worksheet 456 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 071°T, 3.9 nm from Tern Island tower. You steer 144°T at 4.6 kn until 1545, then 202°T at 8.5 kn until 1610.

   Give the 1610 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 0715 you fix your position 276°T, 2.5 nm from Tern Island tower. You steer 247°T at 7.0 kn until 0750, then 353°T at 4.6 kn until 0830.

   Give the 0830 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 1500 you fix your position 054°T, 1.1 nm from Gannet Rock daybeacon. You steer 185°T at 4.5 kn until 1515, then 022°T at 7.7 kn until 1550.

   Give the 1550 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 1105 you fix your position 176°T, 1.5 nm from Gannet Rock daybeacon. You steer 033°T at 6.1 kn until 1115, then 078°T at 5.1 kn until 1130.

   Give the 1130 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 1150 you fix your position 091°T, 3.6 nm from Westfield church spire. You steer 019°T at 4.3 kn until 1205, then 200°T at 6.4 kn until 1230.

   Give the 1230 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 0835 you fix your position 334°T, 2.7 nm from Kittle water tank. You steer 078°T at 7.2 kn until 0855, then 310°T at 8.3 kn until 0915.

   Give the 0915 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 1255 you fix your position 053°T, 3.4 nm from Gannet Rock daybeacon. You steer 254°T at 7.7 kn until 1310, then 049°T at 5.8 kn until 1340.

   Give the 1340 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 1505 you fix your position 047°T, 3.8 nm from Gannet Rock daybeacon. You steer 352°T at 4.3 kn until 1520, then 190°T at 7.3 kn until 1605.

   Give the 1605 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