Worksheet 13 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 023°T, 0.9 nm from Kittle water tank. You steer 349°T at 8.6 kn until 1115, then 052°T at 7.2 kn until 1125.

   Give the 1125 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 1155 you fix your position 055°T, 2.7 nm from Gannet Rock daybeacon. You steer 337°T at 8.5 kn until 1205, then 155°T at 7.7 kn until 1215.

   Give the 1215 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 1050 you fix your position 236°T, 2.9 nm from Tern Island tower. You steer 195°T at 5.4 kn until 1110, then 129°T at 7.7 kn until 1120.

   Give the 1120 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  

4. At 1350 you fix your position 293°T, 2.1 nm from Tern Island tower. You steer 151°T at 7.2 kn until 1435, then 111°T at 4.9 kn until 1445.

   Give the 1445 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 1510 you fix your position 221°T, 2.5 nm from Gannet Rock daybeacon. You steer 278°T at 8.8 kn until 1525, then 088°T at 8.5 kn until 1545.

   Give the 1545 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  

6. At 1355 you fix your position 344°T, 2.7 nm from Kittle water tank. You steer 249°T at 10.0 kn until 1415, then 286°T at 7.9 kn until 1450.

   Give the 1450 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 1535 you fix your position 326°T, 2.7 nm from Tern Island tower. You steer 240°T at 4.1 kn until 1600, then 095°T at 9.0 kn until 1625.

   Give the 1625 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 1335 you fix your position 102°T, 1.5 nm from Westfield church spire. You steer 198°T at 5.7 kn until 1345, then 110°T at 5.5 kn until 1415.

   Give the 1415 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