Worksheet 86 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 125°T, 1.7 nm from Gannet Rock daybeacon. You steer 030°T at 8.5 kn until 1615, then 205°T at 6.1 kn until 1700.

   Give the 1700 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  

2. At 1535 you fix your position 346°T, 3.1 nm from Kittle water tank. You steer 094°T at 6.2 kn until 1600, then 252°T at 7.5 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  

3. At 1030 you fix your position 041°T, 2.9 nm from Gannet Rock daybeacon. You steer 097°T at 4.0 kn until 1045, then 252°T at 4.8 kn until 1110.

   Give the 1110 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 1425 you fix your position 077°T, 3.3 nm from Westfield church spire. You steer 072°T at 7.0 kn until 1435, then 187°T at 4.4 kn until 1510.

   Give the 1510 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  

5. At 1450 you fix your position 298°T, 3.0 nm from Tern Island tower. You steer 247°T at 6.6 kn until 1520, then 092°T at 8.4 kn until 1535.

   Give the 1535 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  

6. At 1545 you fix your position 076°T, 2.6 nm from Tern Island tower. You steer 221°T at 4.2 kn until 1555, then 133°T at 9.9 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  

7. At 1110 you fix your position 026°T, 1.5 nm from Tern Island tower. You steer 301°T at 4.3 kn until 1120, then 231°T at 6.3 kn until 1135.

   Give the 1135 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 1200 you fix your position 264°T, 1.5 nm from Tern Island tower. You steer 188°T at 8.1 kn until 1215, then 141°T at 6.8 kn until 1225.

   Give the 1225 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