Worksheet 501 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 352°T, 3.2 nm from Mill stack. You steer 348°T at 6.1 kn until 0750, then 143°T at 9.4 kn until 0820.

   Give the 0820 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 1125 you fix your position 005°T, 0.9 nm from Gannet Rock daybeacon. You steer 132°T at 5.5 kn until 1155, then 058°T at 4.3 kn until 1205.

   Give the 1205 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  

3. At 0845 you fix your position 064°T, 3.7 nm from Westfield church spire. You steer 138°T at 6.2 kn until 0920, then 334°T at 6.5 kn until 0955.

   Give the 0955 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 0730 you fix your position 023°T, 2.7 nm from Heron Point Light. You steer 117°T at 9.0 kn until 0755, then 341°T at 4.1 kn until 0805.

   Give the 0805 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 1330 you fix your position 138°T, 1.9 nm from Westfield church spire. You steer 142°T at 4.9 kn until 1400, then 323°T at 7.7 kn until 1425.

   Give the 1425 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 1245 you fix your position 064°T, 3.2 nm from Westfield church spire. You steer 190°T at 7.6 kn until 1315, then 291°T at 6.1 kn until 1330.

   Give the 1330 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 1010 you fix your position 054°T, 2.6 nm from Tern Island tower. You steer 093°T at 5.4 kn until 1020, then 280°T at 4.3 kn until 1040.

   Give the 1040 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 1350 you fix your position 045°T, 1.5 nm from Tern Island tower. You steer 118°T at 7.0 kn until 1400, then 168°T at 4.1 kn until 1410.

   Give the 1410 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