Worksheet 599 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 053°T, 1.9 nm from Heron Point Light. You steer 047°T at 5.5 kn until 0850, then 221°T at 5.3 kn until 0925.

   Give the 0925 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  

2. At 1140 you fix your position 098°T, 2.1 nm from Gannet Rock daybeacon. You steer 257°T at 8.8 kn until 1205, then 342°T at 4.9 kn until 1230.

   Give the 1230 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 0705 you fix your position 052°T, 3.3 nm from Heron Point Light. You steer 227°T at 4.1 kn until 0730, then 287°T at 7.2 kn until 0740.

   Give the 0740 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 1335 you fix your position 222°T, 2.3 nm from Tern Island tower. You steer 150°T at 5.5 kn until 1400, then 285°T at 5.7 kn until 1410.

   Give the 1410 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 1505 you fix your position 074°T, 2.4 nm from Heron Point Light. You steer 050°T at 9.4 kn until 1520, then 141°T at 6.0 kn until 1540.

   Give the 1540 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 0835 you fix your position 295°T, 3.8 nm from Tern Island tower. You steer 171°T at 8.1 kn until 0855, then 326°T at 6.7 kn until 0910.

   Give the 0910 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 1020 you fix your position 014°T, 1.2 nm from Gannet Rock daybeacon. You steer 120°T at 8.7 kn until 1040, then 158°T at 5.1 kn until 1055.

   Give the 1055 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  

8. At 1415 you fix your position 007°T, 1.6 nm from Kittle water tank. You steer 293°T at 6.2 kn until 1455, then 337°T at 6.4 kn until 1510.

   Give the 1510 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