Worksheet 97 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 267°T, 2.2 nm from Tern Island tower. You steer 189°T at 7.4 kn until 1115, then 299°T at 6.0 kn until 1155.

   Give the 1155 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  

2. At 0735 you fix your position 329°T, 1.9 nm from Tern Island tower. You steer 194°T at 6.3 kn until 0750, then 278°T at 5.4 kn until 0820.

   Give the 0820 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  

3. At 1215 you fix your position 230°T, 2.6 nm from Tern Island tower. You steer 279°T at 9.1 kn until 1235, then 205°T at 7.7 kn until 1255.

   Give the 1255 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 1600 you fix your position 077°T, 1.9 nm from Gannet Rock daybeacon. You steer 009°T at 8.9 kn until 1610, then 249°T at 4.4 kn until 1650.

   Give the 1650 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 0945 you fix your position 243°T, 3.2 nm from Tern Island tower. You steer 186°T at 4.6 kn until 0955, then 311°T at 5.8 kn until 1005.

   Give the 1005 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  

6. At 0920 you fix your position 045°T, 2.5 nm from Mill stack. You steer 254°T at 4.0 kn until 0935, then 099°T at 6.5 kn until 0950.

   Give the 0950 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  

7. At 1310 you fix your position 001°T, 2.8 nm from Mill stack. You steer 237°T at 4.7 kn until 1320, then 308°T at 4.8 kn until 1350.

   Give the 1350 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 0910 you fix your position 082°T, 2.1 nm from Gannet Rock daybeacon. You steer 129°T at 4.8 kn until 0925, then 323°T at 4.9 kn until 0955.

   Give the 0955 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