Worksheet 193 · Skill 3

Dead reckoning

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1. At 1150 you fix your position 187°T, 1.5 nm from Gannet Rock daybeacon. You steer 293°T at 8.8 kn until 1205, then 348°T at 5.0 kn until 1230.

   Give the 1230 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 0830 you fix your position 033°T, 1.7 nm from Kittle water tank. You steer 334°T at 9.4 kn until 0915, then 234°T at 8.3 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  

3. At 1205 you fix your position 043°T, 2.8 nm from Heron Point Light. You steer 076°T at 7.0 kn until 1250, then 236°T at 8.6 kn until 1320.

   Give the 1320 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 0800 you fix your position 237°T, 3.2 nm from Tern Island tower. You steer 316°T at 9.3 kn until 0815, then 161°T at 10.0 kn until 0845.

   Give the 0845 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  

5. At 1300 you fix your position 245°T, 3.4 nm from Tern Island tower. You steer 164°T at 6.7 kn until 1310, then 111°T at 7.9 kn until 1340.

   Give the 1340 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 1425 you fix your position 009°T, 2.4 nm from Heron Point Light. You steer 064°T at 5.2 kn until 1510, then 278°T at 7.4 kn until 1545.

   Give the 1545 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  

7. At 1545 you fix your position 016°T, 2.0 nm from Tern Island tower. You steer 269°T at 4.5 kn until 1625, then 106°T at 6.2 kn until 1710.

   Give the 1710 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 025°T, 2.6 nm from Westfield church spire. You steer 275°T at 7.0 kn until 1400, then 077°T at 8.1 kn until 1410.

   Give the 1410 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