Worksheet 499 · Skill 3

Dead reckoning

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1. At 0940 you fix your position 040°T, 3.1 nm from Westfield church spire. You steer 310°T at 8.7 kn until 0950, then 166°T at 6.5 kn until 1030.

   Give the 1030 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  

2. At 1020 you fix your position 215°T, 2.5 nm from Tern Island tower. You steer 150°T at 9.8 kn until 1040, then 046°T at 9.9 kn until 1050.

   Give the 1050 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  

3. At 0935 you fix your position 228°T, 1.5 nm from Gannet Rock daybeacon. You steer 309°T at 8.4 kn until 1015, then 210°T at 9.2 kn until 1030.

   Give the 1030 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  

4. At 1000 you fix your position 294°T, 1.2 nm from Gannet Rock daybeacon. You steer 043°T at 8.3 kn until 1040, then 228°T at 7.0 kn until 1105.

   Give the 1105 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  

5. At 1200 you fix your position 072°T, 2.3 nm from Heron Point Light. You steer 078°T at 7.2 kn until 1225, then 261°T at 4.6 kn until 1245.

   Give the 1245 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  

6. At 0715 you fix your position 072°T, 2.7 nm from Westfield church spire. You steer 345°T at 5.2 kn until 0740, then 231°T at 7.8 kn until 0800.

   Give the 0800 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  

7. At 1155 you fix your position 076°T, 1.4 nm from Gannet Rock daybeacon. You steer 046°T at 9.7 kn until 1205, then 343°T at 8.8 kn until 1220.

   Give the 1220 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 0710 you fix your position 075°T, 3.2 nm from Westfield church spire. You steer 201°T at 9.4 kn until 0725, then 055°T at 7.3 kn until 0740.

   Give the 0740 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