Worksheet 113 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 217°T, 2.7 nm from Tern Island tower. You steer 289°T at 7.1 kn until 0915, then 341°T at 6.3 kn until 0945.

   Give the 0945 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  

2. At 0930 you fix your position 029°T, 2.0 nm from Kittle water tank. You steer 319°T at 8.1 kn until 1000, then 047°T at 8.6 kn until 1010.

   Give the 1010 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 1110 you fix your position 062°T, 3.2 nm from Gannet Rock daybeacon. You steer 004°T at 4.3 kn until 1130, then 219°T at 5.3 kn until 1215.

   Give the 1215 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  

4. At 0800 you fix your position 295°T, 2.3 nm from Tern Island tower. You steer 247°T at 5.0 kn until 0840, then 289°T at 5.8 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  

5. At 1350 you fix your position 157°T, 1.2 nm from Gannet Rock daybeacon. You steer 279°T at 4.5 kn until 1400, then 068°T at 5.7 kn until 1415.

   Give the 1415 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 0705 you fix your position 037°T, 2.8 nm from Heron Point Light. You steer 082°T at 5.9 kn until 0715, then 346°T at 6.9 kn until 0730.

   Give the 0730 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  

7. At 1425 you fix your position 291°T, 2.1 nm from Tern Island tower. You steer 285°T at 4.8 kn until 1445, then 070°T at 4.3 kn until 1455.

   Give the 1455 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 1425 you fix your position 041°T, 2.3 nm from Tern Island tower. You steer 082°T at 9.2 kn until 1435, then 210°T at 5.2 kn until 1510.

   Give the 1510 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