Worksheet 596 · Skill 3

Dead reckoning

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1. At 0710 you fix your position 086°T, 1.6 nm from Tern Island tower. You steer 100°T at 7.6 kn until 0720, then 191°T at 9.5 kn until 0750.

   Give the 0750 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 1120 you fix your position 034°T, 4.3 nm from Gannet Rock daybeacon. You steer 207°T at 4.8 kn until 1200, then 019°T at 7.7 kn until 1235.

   Give the 1235 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 1455 you fix your position 251°T, 3.7 nm from Tern Island tower. You steer 232°T at 7.7 kn until 1515, then 070°T at 5.7 kn until 1525.

   Give the 1525 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 0945 you fix your position 241°T, 3.1 nm from Tern Island tower. You steer 110°T at 4.2 kn until 1010, then 202°T at 9.9 kn until 1025.

   Give the 1025 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 0850 you fix your position 253°T, 2.1 nm from Gannet Rock daybeacon. You steer 035°T at 8.6 kn until 0905, then 220°T at 7.6 kn until 0920.

   Give the 0920 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 0930 you fix your position 052°T, 1.8 nm from Heron Point Light. You steer 323°T at 4.5 kn until 1010, then 174°T at 4.1 kn until 1020.

   Give the 1020 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 1345 you fix your position 194°T, 1.8 nm from Gannet Rock daybeacon. You steer 114°T at 5.7 kn until 1355, then 308°T at 6.1 kn until 1440.

   Give the 1440 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 1320 you fix your position 070°T, 2.2 nm from Tern Island tower. You steer 163°T at 6.5 kn until 1355, then 260°T at 6.3 kn until 1405.

   Give the 1405 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