Worksheet 427 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 258°T, 1.9 nm from Gannet Rock daybeacon. You steer 265°T at 9.8 kn until 0740, then 157°T at 4.8 kn until 0800.

   Give the 0800 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  

2. At 1015 you fix your position 058°T, 2.1 nm from Heron Point Light. You steer 072°T at 8.1 kn until 1035, then 232°T at 6.0 kn until 1110.

   Give the 1110 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  

3. At 0845 you fix your position 054°T, 2.0 nm from Heron Point Light. You steer 302°T at 5.9 kn until 0855, then 335°T at 5.8 kn until 0930.

   Give the 0930 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  

4. At 1010 you fix your position 136°T, 1.6 nm from Gannet Rock daybeacon. You steer 280°T at 6.4 kn until 1025, then 146°T at 8.7 kn until 1035.

   Give the 1035 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  

5. At 1315 you fix your position 052°T, 2.3 nm from Heron Point Light. You steer 019°T at 5.8 kn until 1325, then 199°T at 6.6 kn until 1340.

   Give the 1340 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 1320 you fix your position 303°T, 3.1 nm from Tern Island tower. You steer 196°T at 9.0 kn until 1345, then 263°T at 6.7 kn until 1405.

   Give the 1405 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 0710 you fix your position 294°T, 2.2 nm from Tern Island tower. You steer 182°T at 9.8 kn until 0720, then 336°T at 4.6 kn until 0740.

   Give the 0740 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 1340 you fix your position 017°T, 1.7 nm from Kittle water tank. You steer 004°T at 9.7 kn until 1410, then 268°T at 6.9 kn until 1420.

   Give the 1420 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