Worksheet 489 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 241°T, 3.5 nm from Tern Island tower. You steer 001°T at 5.0 kn until 1055, then 223°T at 6.0 kn until 1105.

   Give the 1105 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 010°T, 1.2 nm from Gannet Rock daybeacon. You steer 109°T at 6.8 kn until 1230, then 168°T at 4.6 kn until 1255.

   Give the 1255 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  

3. At 1100 you fix your position 040°T, 1.9 nm from Tern Island tower. You steer 280°T at 9.7 kn until 1130, then 099°T at 7.0 kn until 1155.

   Give the 1155 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 0850 you fix your position 265°T, 2.5 nm from Tern Island tower. You steer 114°T at 7.1 kn until 0905, then 194°T at 9.3 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  

5. At 0855 you fix your position 066°T, 3.8 nm from Tern Island tower. You steer 054°T at 7.8 kn until 0905, then 175°T at 7.2 kn until 0940.

   Give the 0940 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 0930 you fix your position 042°T, 2.3 nm from Kittle water tank. You steer 308°T at 8.1 kn until 0950, then 274°T at 4.8 kn until 1010.

   Give the 1010 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  

7. At 0755 you fix your position 014°T, 2.7 nm from Mill stack. You steer 296°T at 9.4 kn until 0830, then 049°T at 8.1 kn until 0850.

   Give the 0850 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  

8. At 1535 you fix your position 037°T, 4.0 nm from Gannet Rock daybeacon. You steer 304°T at 5.8 kn until 1555, then 200°T at 8.3 kn until 1640.

   Give the 1640 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