Worksheet 91 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 055°T, 3.2 nm from Heron Point Light. You steer 144°T at 5.4 kn until 0820, then 030°T at 9.7 kn until 0850.

   Give the 0850 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 1345 you fix your position 214°T, 1.8 nm from Tern Island tower. You steer 282°T at 6.7 kn until 1355, then 153°T at 6.4 kn until 1415.

   Give the 1415 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  

3. At 1525 you fix your position 241°T, 2.2 nm from Tern Island tower. You steer 270°T at 5.0 kn until 1540, then 113°T at 4.0 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  

4. At 1315 you fix your position 273°T, 3.4 nm from Tern Island tower. You steer 213°T at 4.4 kn until 1350, then 007°T at 6.3 kn until 1420.

   Give the 1420 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 1200 you fix your position 088°T, 2.5 nm from Tern Island tower. You steer 148°T at 5.6 kn until 1245, then 326°T at 7.4 kn until 1320.

   Give the 1320 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 1020 you fix your position 012°T, 2.4 nm from Heron Point Light. You steer 049°T at 4.5 kn until 1030, then 354°T at 5.3 kn until 1040.

   Give the 1040 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 1205 you fix your position 068°T, 2.6 nm from Tern Island tower. You steer 204°T at 9.1 kn until 1235, then 270°T at 7.7 kn until 1320.

   Give the 1320 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  

8. At 1040 you fix your position 328°T, 1.3 nm from Kittle water tank. You steer 306°T at 4.9 kn until 1125, then 076°T at 4.2 kn until 1205.

   Give the 1205 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