Worksheet 179 · Skill 3

Dead reckoning

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1. At 1600 you fix your position 284°T, 4.0 nm from Tern Island tower. You steer 244°T at 7.2 kn until 1625, then 073°T at 6.7 kn until 1710.

   Give the 1710 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 1050 you fix your position 315°T, 1.2 nm from Kittle water tank. You steer 036°T at 9.6 kn until 1100, then 318°T at 6.4 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  

3. At 1245 you fix your position 075°T, 2.8 nm from Westfield church spire. You steer 264°T at 7.2 kn until 1255, then 081°T at 8.6 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  

4. At 1130 you fix your position 041°T, 3.4 nm from Heron Point Light. You steer 166°T at 5.4 kn until 1145, then 352°T at 4.9 kn until 1230.

   Give the 1230 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 0945 you fix your position 353°T, 0.9 nm from Heron Point Light. You steer 349°T at 6.8 kn until 1000, then 095°T at 4.7 kn until 1045.

   Give the 1045 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 0915 you fix your position 252°T, 1.8 nm from Tern Island tower. You steer 288°T at 6.6 kn until 0935, then 350°T at 4.2 kn until 1000.

   Give the 1000 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 1300 you fix your position 259°T, 2.8 nm from Tern Island tower. You steer 172°T at 7.5 kn until 1330, then 092°T at 6.3 kn until 1415.

   Give the 1415 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  

8. At 1125 you fix your position 332°T, 1.8 nm from Heron Point Light. You steer 105°T at 8.9 kn until 1205, then 009°T at 7.1 kn until 1215.

   Give the 1215 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