Worksheet 465 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 041°T, 3.1 nm from Heron Point Light. You steer 004°T at 7.8 kn until 1300, then 119°T at 9.2 kn until 1330.

   Give the 1330 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 1100 you fix your position 036°T, 3.1 nm from Westfield church spire. You steer 294°T at 5.2 kn until 1120, then 113°T at 4.8 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  

3. At 1050 you fix your position 039°T, 0.9 nm from Heron Point Light. You steer 093°T at 9.9 kn until 1100, then 340°T at 7.8 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  

4. At 1320 you fix your position 075°T, 1.9 nm from Gannet Rock daybeacon. You steer 158°T at 9.1 kn until 1335, then 318°T at 7.6 kn until 1400.

   Give the 1400 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  

5. At 1450 you fix your position 298°T, 1.7 nm from Tern Island tower. You steer 205°T at 6.0 kn until 1500, then 051°T at 5.1 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  

6. At 0935 you fix your position 004°T, 2.4 nm from Tern Island tower. You steer 250°T at 7.2 kn until 1020, then 166°T at 7.8 kn until 1050.

   Give the 1050 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 0850 you fix your position 059°T, 2.2 nm from Westfield church spire. You steer 077°T at 9.4 kn until 0915, then 338°T at 4.2 kn until 0940.

   Give the 0940 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  

8. At 1345 you fix your position 287°T, 3.7 nm from Tern Island tower. You steer 198°T at 9.3 kn until 1400, then 303°T at 5.8 kn until 1425.

   Give the 1425 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