Worksheet 574 · Skill 3

Dead reckoning

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1. At 0920 you fix your position 069°T, 2.3 nm from Heron Point Light. You steer 009°T at 4.7 kn until 0945, then 203°T at 4.2 kn until 1005.

   Give the 1005 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 0840 you fix your position 340°T, 0.9 nm from Kittle water tank. You steer 329°T at 6.1 kn until 0850, then 119°T at 4.0 kn until 0900.

   Give the 0900 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  

3. At 1245 you fix your position 073°T, 2.6 nm from Tern Island tower. You steer 281°T at 4.4 kn until 1320, then 032°T at 5.4 kn until 1335.

   Give the 1335 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 1030 you fix your position 181°T, 1.4 nm from Tern Island tower. You steer 258°T at 9.3 kn until 1110, then 074°T at 9.1 kn until 1140.

   Give the 1140 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 1040 you fix your position 241°T, 1.5 nm from Tern Island tower. You steer 150°T at 5.9 kn until 1110, then 334°T at 4.8 kn until 1120.

   Give the 1120 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  

6. At 0945 you fix your position 204°T, 2.4 nm from Gannet Rock daybeacon. You steer 288°T at 8.3 kn until 1010, then 323°T at 6.6 kn until 1045.

   Give the 1045 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 1055 you fix your position 045°T, 3.6 nm from Westfield church spire. You steer 229°T at 7.8 kn until 1110, then 335°T at 5.2 kn until 1125.

   Give the 1125 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 1545 you fix your position 314°T, 3.1 nm from Tern Island tower. You steer 133°T at 9.6 kn until 1555, then 076°T at 8.1 kn until 1605.

   Give the 1605 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