Worksheet 463 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 067°T, 1.3 nm from Heron Point Light. You steer 337°T at 4.3 kn until 1030, then 172°T at 6.0 kn until 1040.

   Give the 1040 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 1150 you fix your position 067°T, 2.3 nm from Westfield church spire. You steer 253°T at 6.6 kn until 1200, then 345°T at 6.5 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  

3. At 1555 you fix your position 337°T, 2.3 nm from Mill stack. You steer 055°T at 4.6 kn until 1610, then 111°T at 5.9 kn until 1625.

   Give the 1625 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  

4. At 0800 you fix your position 130°T, 1.8 nm from Westfield church spire. You steer 076°T at 4.2 kn until 0835, then 218°T at 7.9 kn until 0855.

   Give the 0855 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  

5. At 1150 you fix your position 190°T, 1.7 nm from Tern Island tower. You steer 170°T at 6.6 kn until 1200, then 289°T at 5.4 kn until 1210.

   Give the 1210 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 0830 you fix your position 054°T, 3.6 nm from Westfield church spire. You steer 309°T at 10.0 kn until 0840, then 217°T at 6.5 kn until 0850.

   Give the 0850 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 1345 you fix your position 303°T, 3.9 nm from Tern Island tower. You steer 085°T at 7.4 kn until 1425, then 133°T at 9.2 kn until 1445.

   Give the 1445 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  

8. At 1445 you fix your position 054°T, 4.0 nm from Westfield church spire. You steer 166°T at 4.1 kn until 1530, then 330°T at 4.3 kn until 1555.

   Give the 1555 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