Worksheet 468 · Skill 3

Dead reckoning

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1. At 1420 you fix your position 297°T, 1.6 nm from Gannet Rock daybeacon. You steer 149°T at 7.5 kn until 1430, then 330°T at 4.9 kn until 1455.

   Give the 1455 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  

2. At 1205 you fix your position 022°T, 2.9 nm from Heron Point Light. You steer 344°T at 6.7 kn until 1235, then 289°T at 4.1 kn until 1250.

   Give the 1250 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 1520 you fix your position 355°T, 1.8 nm from Mill stack. You steer 034°T at 5.7 kn until 1530, then 347°T at 7.9 kn until 1550.

   Give the 1550 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 0900 you fix your position 081°T, 2.1 nm from Heron Point Light. You steer 106°T at 4.9 kn until 0945, then 060°T at 6.7 kn until 1010.

   Give the 1010 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 1015 you fix your position 077°T, 2.3 nm from Westfield church spire. You steer 075°T at 9.7 kn until 1025, then 210°T at 5.1 kn until 1035.

   Give the 1035 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  

6. At 0925 you fix your position 280°T, 1.3 nm from Gannet Rock daybeacon. You steer 250°T at 6.2 kn until 1010, then 113°T at 9.4 kn until 1020.

   Give the 1020 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  

7. At 1500 you fix your position 064°T, 2.2 nm from Westfield church spire. You steer 111°T at 7.9 kn until 1530, then 182°T at 5.0 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 1205 you fix your position 250°T, 2.4 nm from Tern Island tower. You steer 172°T at 5.1 kn until 1215, then 071°T at 4.5 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