Worksheet 122 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 086°T, 2.2 nm from Heron Point Light. You steer 338°T at 5.4 kn until 1110, then 092°T at 7.1 kn until 1145.

   Give the 1145 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 1400 you fix your position 050°T, 2.5 nm from Tern Island tower. You steer 187°T at 6.0 kn until 1420, then 236°T at 6.4 kn until 1435.

   Give the 1435 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 1035 you fix your position 093°T, 2.6 nm from Westfield church spire. You steer 333°T at 5.7 kn until 1050, then 073°T at 4.7 kn until 1120.

   Give the 1120 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  

4. At 0935 you fix your position 180°T, 1.4 nm from Gannet Rock daybeacon. You steer 033°T at 8.4 kn until 0945, then 133°T at 6.9 kn until 1015.

   Give the 1015 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 1215 you fix your position 270°T, 2.7 nm from Tern Island tower. You steer 147°T at 5.4 kn until 1250, then 002°T at 7.1 kn until 1300.

   Give the 1300 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  

6. At 0825 you fix your position 029°T, 2.8 nm from Westfield church spire. You steer 154°T at 6.7 kn until 0910, then 251°T at 6.5 kn until 0920.

   Give the 0920 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 1515 you fix your position 359°T, 2.2 nm from Mill stack. You steer 336°T at 5.9 kn until 1545, then 181°T at 7.1 kn until 1615.

   Give the 1615 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  

8. At 1440 you fix your position 061°T, 3.4 nm from Westfield church spire. You steer 109°T at 6.8 kn until 1505, then 225°T at 9.8 kn until 1520.

   Give the 1520 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