Worksheet 371 · Skill 3

Dead reckoning

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1. At 1540 you fix your position 076°T, 2.4 nm from Tern Island tower. You steer 047°T at 8.0 kn until 1600, then 218°T at 8.5 kn until 1610.

   Give the 1610 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 1515 you fix your position 215°T, 1.5 nm from Tern Island tower. You steer 227°T at 4.9 kn until 1540, then 357°T at 9.1 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  

3. At 1530 you fix your position 027°T, 1.5 nm from Heron Point Light. You steer 150°T at 8.4 kn until 1545, then 102°T at 7.1 kn until 1555.

   Give the 1555 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  

4. At 0855 you fix your position 034°T, 1.2 nm from Westfield church spire. You steer 083°T at 4.4 kn until 0905, then 183°T at 4.6 kn until 0945.

   Give the 0945 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  

5. At 1450 you fix your position 047°T, 3.1 nm from Gannet Rock daybeacon. You steer 231°T at 5.1 kn until 1520, then 159°T at 6.0 kn until 1530.

   Give the 1530 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  

6. At 1535 you fix your position 265°T, 1.5 nm from Tern Island tower. You steer 215°T at 5.5 kn until 1610, then 172°T at 7.1 kn until 1630.

   Give the 1630 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 1120 you fix your position 202°T, 2.1 nm from Gannet Rock daybeacon. You steer 320°T at 7.5 kn until 1155, then 016°T at 8.4 kn until 1205.

   Give the 1205 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 1200 you fix your position 063°T, 2.7 nm from Gannet Rock daybeacon. You steer 255°T at 5.2 kn until 1215, then 202°T at 5.8 kn until 1230.

   Give the 1230 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