Worksheet 584 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 030°T, 1.3 nm from Gannet Rock daybeacon. You steer 022°T at 9.2 kn until 1540, then 181°T at 6.8 kn until 1550.

   Give the 1550 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 1040 you fix your position 087°T, 2.6 nm from Westfield church spire. You steer 031°T at 5.1 kn until 1125, then 269°T at 10.0 kn until 1150.

   Give the 1150 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 0940 you fix your position 061°T, 2.0 nm from Tern Island tower. You steer 139°T at 9.2 kn until 0955, then 063°T at 4.6 kn until 1015.

   Give the 1015 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 0815 you fix your position 236°T, 1.9 nm from Tern Island tower. You steer 095°T at 5.4 kn until 0850, then 260°T at 8.8 kn until 0900.

   Give the 0900 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 0740 you fix your position 230°T, 1.7 nm from Gannet Rock daybeacon. You steer 276°T at 8.0 kn until 0755, then 313°T at 9.6 kn until 0820.

   Give the 0820 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 1135 you fix your position 251°T, 2.6 nm from Gannet Rock daybeacon. You steer 288°T at 4.8 kn until 1200, then 177°T at 5.7 kn until 1225.

   Give the 1225 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 1350 you fix your position 259°T, 2.7 nm from Tern Island tower. You steer 277°T at 8.6 kn until 1400, then 218°T at 4.2 kn until 1410.

   Give the 1410 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  

8. At 1020 you fix your position 031°T, 1.2 nm from Kittle water tank. You steer 336°T at 8.0 kn until 1100, then 050°T at 4.2 kn until 1115.

   Give the 1115 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