Worksheet 73 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 071°T, 2.3 nm from Heron Point Light. You steer 143°T at 5.2 kn until 1020, then 356°T at 9.4 kn until 1035.

   Give the 1035 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 0840 you fix your position 053°T, 2.1 nm from Westfield church spire. You steer 195°T at 5.0 kn until 0920, then 109°T at 4.5 kn until 1000.

   Give the 1000 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 1450 you fix your position 235°T, 2.6 nm from Gannet Rock daybeacon. You steer 053°T at 7.5 kn until 1500, then 088°T at 5.9 kn until 1545.

   Give the 1545 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  

4. At 0930 you fix your position 241°T, 1.7 nm from Gannet Rock daybeacon. You steer 282°T at 8.9 kn until 1000, then 150°T at 5.9 kn until 1035.

   Give the 1035 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 0855 you fix your position 050°T, 2.4 nm from Heron Point Light. You steer 199°T at 7.7 kn until 0905, then 089°T at 9.5 kn until 0945.

   Give the 0945 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 0935 you fix your position 211°T, 3.3 nm from Tern Island tower. You steer 350°T at 4.7 kn until 1020, then 150°T at 6.4 kn until 1100.

   Give the 1100 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  

7. At 1130 you fix your position 340°T, 2.3 nm from Mill stack. You steer 067°T at 9.8 kn until 1145, then 286°T at 9.4 kn until 1215.

   Give the 1215 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  

8. At 1345 you fix your position 049°T, 3.7 nm from Westfield church spire. You steer 118°T at 7.6 kn until 1355, then 155°T at 5.7 kn until 1430.

   Give the 1430 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