Worksheet 783 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 246°T, 3.6 nm from Tern Island tower. You steer 008°T at 4.4 kn until 1045, then 132°T at 6.9 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  

2. At 1505 you fix your position 046°T, 2.6 nm from Westfield church spire. You steer 146°T at 6.0 kn until 1535, then 202°T at 6.7 kn until 1545.

   Give the 1545 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  

3. At 1545 you fix your position 270°T, 3.2 nm from Tern Island tower. You steer 189°T at 5.8 kn until 1600, then 116°T at 6.8 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  

4. At 1510 you fix your position 012°T, 1.7 nm from Tern Island tower. You steer 140°T at 9.8 kn until 1540, then 187°T at 5.4 kn until 1605.

   Give the 1605 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  

5. At 1210 you fix your position 288°T, 3.9 nm from Tern Island tower. You steer 202°T at 4.5 kn until 1255, then 055°T at 6.3 kn until 1325.

   Give the 1325 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 1505 you fix your position 320°T, 1.6 nm from Tern Island tower. You steer 076°T at 4.3 kn until 1525, then 110°T at 5.9 kn until 1540.

   Give the 1540 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  

7. At 1500 you fix your position 196°T, 2.1 nm from Tern Island tower. You steer 152°T at 5.8 kn until 1525, then 319°T at 5.9 kn until 1600.

   Give the 1600 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 1555 you fix your position 205°T, 2.1 nm from Tern Island tower. You steer 073°T at 8.8 kn until 1630, then 275°T at 5.7 kn until 1650.

   Give the 1650 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