Worksheet 319 · Skill 3

Dead reckoning

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1. At 0900 you fix your position 308°T, 0.9 nm from Gannet Rock daybeacon. You steer 258°T at 7.2 kn until 0930, then 106°T at 8.4 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  

2. At 1505 you fix your position 270°T, 2.4 nm from Tern Island tower. You steer 140°T at 7.1 kn until 1535, then 316°T at 8.4 kn until 1610.

   Give the 1610 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 1020 you fix your position 274°T, 3.7 nm from Tern Island tower. You steer 146°T at 8.9 kn until 1040, then 312°T at 6.2 kn until 1110.

   Give the 1110 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  

4. At 1210 you fix your position 308°T, 3.0 nm from Tern Island tower. You steer 049°T at 4.9 kn until 1220, then 219°T at 6.5 kn until 1250.

   Give the 1250 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 1145 you fix your position 295°T, 3.4 nm from Tern Island tower. You steer 197°T at 8.7 kn until 1205, then 334°T at 9.8 kn until 1230.

   Give the 1230 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  

6. At 1200 you fix your position 046°T, 4.1 nm from Westfield church spire. You steer 204°T at 6.0 kn until 1220, then 072°T at 9.1 kn until 1245.

   Give the 1245 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 1445 you fix your position 049°T, 3.2 nm from Heron Point Light. You steer 090°T at 10.0 kn until 1455, then 178°T at 6.2 kn until 1515.

   Give the 1515 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  

8. At 0850 you fix your position 111°T, 1.2 nm from Westfield church spire. You steer 120°T at 4.9 kn until 0915, then 087°T at 6.4 kn until 0955.

   Give the 0955 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