Worksheet 721 · Skill 3

Dead reckoning

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1. At 0955 you fix your position 264°T, 2.6 nm from Gannet Rock daybeacon. You steer 301°T at 4.1 kn until 1010, then 194°T at 5.6 kn until 1030.

   Give the 1030 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

2. At 0740 you fix your position 210°T, 3.1 nm from Tern Island tower. You steer 001°T at 6.3 kn until 0825, then 264°T at 9.5 kn until 0835.

   Give the 0835 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 1055 you fix your position 075°T, 2.2 nm from Tern Island tower. You steer 051°T at 4.7 kn until 1125, then 126°T at 5.5 kn until 1135.

   Give the 1135 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 0810 you fix your position 055°T, 2.7 nm from Heron Point Light. You steer 217°T at 4.9 kn until 0820, then 096°T at 6.2 kn until 0900.

   Give the 0900 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 1215 you fix your position 092°T, 2.2 nm from Gannet Rock daybeacon. You steer 336°T at 8.8 kn until 1245, then 198°T at 8.9 kn until 1255.

   Give the 1255 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 0815 you fix your position 033°T, 3.7 nm from Westfield church spire. You steer 227°T at 5.0 kn until 0830, then 111°T at 6.8 kn until 0850.

   Give the 0850 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 0955 you fix your position 289°T, 2.3 nm from Tern Island tower. You steer 327°T at 4.5 kn until 1010, then 190°T at 6.3 kn until 1050.

   Give the 1050 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 1400 you fix your position 235°T, 3.3 nm from Tern Island tower. You steer 349°T at 5.4 kn until 1435, then 250°T at 4.9 kn until 1500.

   Give the 1500 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