Worksheet 330 · Skill 3

Dead reckoning

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1. At 1340 you fix your position 056°T, 2.3 nm from Westfield church spire. You steer 140°T at 4.9 kn until 1415, then 016°T at 7.4 kn until 1440.

   Give the 1440 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 1220 you fix your position 037°T, 3.7 nm from Westfield church spire. You steer 089°T at 8.6 kn until 1255, then 258°T at 4.9 kn until 1335.

   Give the 1335 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 1200 you fix your position 245°T, 2.8 nm from Tern Island tower. You steer 315°T at 7.5 kn until 1215, then 114°T at 9.7 kn until 1240.

   Give the 1240 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 0725 you fix your position 007°T, 2.3 nm from Mill stack. You steer 133°T at 4.1 kn until 0740, then 071°T at 8.7 kn until 0815.

   Give the 0815 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 1135 you fix your position 342°T, 1.0 nm from Gannet Rock daybeacon. You steer 283°T at 9.1 kn until 1145, then 189°T at 4.8 kn until 1225.

   Give the 1225 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  

6. At 0910 you fix your position 357°T, 1.2 nm from Kittle water tank. You steer 237°T at 5.1 kn until 0920, then 052°T at 8.5 kn until 0940.

   Give the 0940 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 0920 you fix your position 020°T, 1.2 nm from Gannet Rock daybeacon. You steer 046°T at 9.3 kn until 0945, then 272°T at 8.0 kn until 1020.

   Give the 1020 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 1445 you fix your position 066°T, 2.9 nm from Tern Island tower. You steer 194°T at 4.2 kn until 1530, then 035°T at 8.1 kn until 1555.

   Give the 1555 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