Worksheet 582 · Skill 3

Dead reckoning

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1. At 0940 you fix your position 074°T, 2.9 nm from Tern Island tower. You steer 055°T at 6.2 kn until 0955, then 012°T at 5.3 kn until 1005.

   Give the 1005 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 0840 you fix your position 220°T, 2.3 nm from Gannet Rock daybeacon. You steer 345°T at 9.7 kn until 0855, then 221°T at 7.4 kn until 0930.

   Give the 0930 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  

3. At 0850 you fix your position 090°T, 1.6 nm from Heron Point Light. You steer 009°T at 8.8 kn until 0920, then 064°T at 4.4 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  

4. At 1230 you fix your position 248°T, 1.8 nm from Gannet Rock daybeacon. You steer 230°T at 4.6 kn until 1300, then 002°T at 4.3 kn until 1320.

   Give the 1320 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  

5. At 1455 you fix your position 299°T, 3.6 nm from Tern Island tower. You steer 245°T at 8.5 kn until 1525, then 066°T at 7.6 kn until 1550.

   Give the 1550 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 1235 you fix your position 036°T, 2.2 nm from Gannet Rock daybeacon. You steer 141°T at 7.0 kn until 1300, then 215°T at 6.2 kn until 1320.

   Give the 1320 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  

7. At 1545 you fix your position 212°T, 2.6 nm from Gannet Rock daybeacon. You steer 057°T at 5.1 kn until 1555, then 310°T at 5.9 kn until 1615.

   Give the 1615 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 1250 you fix your position 238°T, 2.2 nm from Gannet Rock daybeacon. You steer 035°T at 4.7 kn until 1325, then 067°T at 7.6 kn until 1350.

   Give the 1350 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