Worksheet 493 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 359°T, 1.7 nm from Heron Point Light. You steer 035°T at 8.7 kn until 0850, then 159°T at 9.8 kn until 0915.

   Give the 0915 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 1200 you fix your position 088°T, 2.3 nm from Gannet Rock daybeacon. You steer 290°T at 7.3 kn until 1230, then 094°T at 5.4 kn until 1315.

   Give the 1315 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  

3. At 1305 you fix your position 050°T, 1.7 nm from Gannet Rock daybeacon. You steer 341°T at 4.3 kn until 1325, then 105°T at 9.0 kn until 1335.

   Give the 1335 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 1130 you fix your position 017°T, 1.6 nm from Kittle water tank. You steer 357°T at 7.0 kn until 1140, then 233°T at 6.4 kn until 1200.

   Give the 1200 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 0910 you fix your position 021°T, 2.0 nm from Gannet Rock daybeacon. You steer 177°T at 9.7 kn until 0920, then 286°T at 7.7 kn until 0950.

   Give the 0950 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 0820 you fix your position 026°T, 2.2 nm from Gannet Rock daybeacon. You steer 183°T at 5.1 kn until 0905, then 281°T at 9.2 kn until 0935.

   Give the 0935 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  

7. At 1245 you fix your position 266°T, 3.6 nm from Tern Island tower. You steer 265°T at 8.0 kn until 1255, then 168°T at 6.7 kn until 1335.

   Give the 1335 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 0920 you fix your position 028°T, 2.4 nm from Gannet Rock daybeacon. You steer 138°T at 4.8 kn until 0955, then 005°T at 7.6 kn until 1020.

   Give the 1020 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