Worksheet 572 · Skill 3

Dead reckoning

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1. At 1050 you fix your position 348°T, 2.6 nm from Mill stack. You steer 016°T at 7.2 kn until 1100, then 300°T at 5.3 kn until 1135.

   Give the 1135 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 0755 you fix your position 062°T, 2.6 nm from Tern Island tower. You steer 267°T at 5.9 kn until 0825, then 228°T at 6.5 kn until 0845.

   Give the 0845 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 1230 you fix your position 276°T, 2.9 nm from Tern Island tower. You steer 153°T at 4.3 kn until 1315, then 261°T at 9.2 kn until 1335.

   Give the 1335 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 0900 you fix your position 030°T, 1.5 nm from Heron Point Light. You steer 351°T at 9.6 kn until 0930, then 159°T at 8.7 kn until 0945.

   Give the 0945 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  

5. At 1340 you fix your position 304°T, 3.9 nm from Tern Island tower. You steer 174°T at 5.2 kn until 1355, then 303°T at 6.5 kn until 1410.

   Give the 1410 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  

6. At 1305 you fix your position 042°T, 2.0 nm from Westfield church spire. You steer 108°T at 5.3 kn until 1345, then 240°T at 6.5 kn until 1405.

   Give the 1405 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  

7. At 1020 you fix your position 056°T, 3.1 nm from Heron Point Light. You steer 291°T at 7.6 kn until 1035, then 098°T at 4.9 kn until 1120.

   Give the 1120 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 1110 you fix your position 018°T, 1.1 nm from Heron Point Light. You steer 342°T at 4.5 kn until 1150, then 156°T at 4.2 kn until 1200.

   Give the 1200 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