Worksheet 248 · Skill 3

Dead reckoning

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1. At 1545 you fix your position 044°T, 4.0 nm from Gannet Rock daybeacon. You steer 283°T at 4.1 kn until 1620, then 074°T at 5.5 kn until 1630.

   Give the 1630 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 1140 you fix your position 157°T, 3.1 nm from Tern Island tower. You steer 137°T at 5.5 kn until 1200, then 292°T at 9.8 kn until 1240.

   Give the 1240 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 0940 you fix your position 353°T, 2.9 nm from Mill stack. You steer 255°T at 7.9 kn until 0955, then 156°T at 4.9 kn until 1010.

   Give the 1010 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  

4. At 1545 you fix your position 300°T, 1.0 nm from Gannet Rock daybeacon. You steer 270°T at 6.2 kn until 1620, then 106°T at 7.1 kn until 1640.

   Give the 1640 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  

5. At 1255 you fix your position 358°T, 2.0 nm from Tern Island tower. You steer 279°T at 9.6 kn until 1315, then 096°T at 9.7 kn until 1350.

   Give the 1350 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 1510 you fix your position 141°T, 1.6 nm from Westfield church spire. You steer 251°T at 5.1 kn until 1520, then 109°T at 8.1 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  

7. At 0945 you fix your position 031°T, 2.8 nm from Kittle water tank. You steer 247°T at 8.0 kn until 1020, then 084°T at 5.7 kn until 1100.

   Give the 1100 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 0835 you fix your position 036°T, 3.7 nm from Gannet Rock daybeacon. You steer 253°T at 6.7 kn until 0845, then 292°T at 8.1 kn until 0920.

   Give the 0920 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