Worksheet 663 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 224°T, 2.8 nm from Tern Island tower. You steer 002°T at 7.1 kn until 0810, then 176°T at 4.5 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  

2. At 0925 you fix your position 244°T, 2.9 nm from Tern Island tower. You steer 001°T at 5.1 kn until 0940, then 064°T at 6.2 kn until 1025.

   Give the 1025 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 0900 you fix your position 029°T, 3.2 nm from Gannet Rock daybeacon. You steer 297°T at 9.0 kn until 0910, then 118°T at 6.1 kn until 0930.

   Give the 0930 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 0925 you fix your position 024°T, 2.3 nm from Westfield church spire. You steer 109°T at 7.0 kn until 0935, then 204°T at 6.8 kn until 0945.

   Give the 0945 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  

5. At 1200 you fix your position 041°T, 3.0 nm from Heron Point Light. You steer 266°T at 8.2 kn until 1215, then 020°T at 6.5 kn until 1240.

   Give the 1240 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  

6. At 1550 you fix your position 296°T, 2.8 nm from Tern Island tower. You steer 083°T at 5.9 kn until 1635, then 177°T at 6.1 kn until 1700.

   Give the 1700 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  

7. At 1210 you fix your position 034°T, 2.6 nm from Gannet Rock daybeacon. You steer 152°T at 7.5 kn until 1240, then 258°T at 6.9 kn until 1255.

   Give the 1255 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 0805 you fix your position 067°T, 2.6 nm from Westfield church spire. You steer 147°T at 4.0 kn until 0835, then 194°T at 5.6 kn until 0855.

   Give the 0855 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