Worksheet 48 · Skill 3

Dead reckoning

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1. At 0930 you fix your position 059°T, 1.8 nm from Tern Island tower. You steer 346°T at 5.4 kn until 0940, then 157°T at 8.1 kn until 1000.

   Give the 1000 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 0805 you fix your position 248°T, 3.0 nm from Tern Island tower. You steer 004°T at 6.3 kn until 0830, then 185°T at 9.1 kn until 0905.

   Give the 0905 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 1055 you fix your position 239°T, 3.3 nm from Tern Island tower. You steer 173°T at 8.1 kn until 1110, then 106°T at 10.0 kn until 1130.

   Give the 1130 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  

4. At 1120 you fix your position 010°T, 1.7 nm from Tern Island tower. You steer 081°T at 7.8 kn until 1135, then 166°T at 4.1 kn until 1150.

   Give the 1150 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 1555 you fix your position 275°T, 2.2 nm from Gannet Rock daybeacon. You steer 187°T at 5.7 kn until 1605, then 025°T at 7.5 kn until 1620.

   Give the 1620 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 0730 you fix your position 038°T, 2.8 nm from Heron Point Light. You steer 112°T at 7.2 kn until 0740, then 265°T at 9.2 kn until 0750.

   Give the 0750 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 0705 you fix your position 279°T, 3.3 nm from Tern Island tower. You steer 305°T at 5.2 kn until 0730, then 026°T at 5.2 kn until 0740.

   Give the 0740 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 1220 you fix your position 060°T, 3.1 nm from Gannet Rock daybeacon. You steer 217°T at 8.3 kn until 1230, then 323°T at 6.1 kn until 1315.

   Give the 1315 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