Worksheet 464 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 089°T, 2.7 nm from Gannet Rock daybeacon. You steer 164°T at 4.0 kn until 1425, then 316°T at 8.2 kn until 1440.

   Give the 1440 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  

2. At 1225 you fix your position 108°T, 2.3 nm from Westfield church spire. You steer 103°T at 6.5 kn until 1245, then 157°T at 7.4 kn until 1305.

   Give the 1305 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  

3. At 1540 you fix your position 079°T, 2.7 nm from Westfield church spire. You steer 129°T at 8.2 kn until 1615, then 055°T at 6.2 kn until 1625.

   Give the 1625 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 1505 you fix your position 251°T, 3.8 nm from Tern Island tower. You steer 295°T at 9.7 kn until 1520, then 031°T at 4.2 kn until 1530.

   Give the 1530 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 0905 you fix your position 282°T, 1.9 nm from Tern Island tower. You steer 194°T at 5.3 kn until 0930, then 236°T at 9.9 kn until 0945.

   Give the 0945 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 1545 you fix your position 331°T, 2.3 nm from Mill stack. You steer 232°T at 5.0 kn until 1600, then 355°T at 7.4 kn until 1610.

   Give the 1610 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 1000 you fix your position 029°T, 2.2 nm from Gannet Rock daybeacon. You steer 270°T at 5.3 kn until 1015, then 129°T at 5.1 kn until 1040.

   Give the 1040 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 0910 you fix your position 099°T, 3.2 nm from Westfield church spire. You steer 306°T at 4.7 kn until 0935, then 124°T at 7.5 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