Worksheet 396 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 250°T, 2.7 nm from Gannet Rock daybeacon. You steer 096°T at 6.5 kn until 1635, then 266°T at 7.4 kn until 1705.

   Give the 1705 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 1415 you fix your position 030°T, 1.8 nm from Gannet Rock daybeacon. You steer 326°T at 4.5 kn until 1500, then 144°T at 5.1 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  

3. At 0750 you fix your position 276°T, 1.8 nm from Tern Island tower. You steer 306°T at 4.5 kn until 0815, then 175°T at 9.3 kn until 0855.

   Give the 0855 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 0950 you fix your position 234°T, 3.3 nm from Tern Island tower. You steer 285°T at 5.8 kn until 1030, then 078°T at 7.1 kn until 1110.

   Give the 1110 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 1445 you fix your position 072°T, 2.1 nm from Heron Point Light. You steer 079°T at 4.5 kn until 1515, then 190°T at 9.8 kn until 1525.

   Give the 1525 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  

6. At 1025 you fix your position 031°T, 3.6 nm from Heron Point Light. You steer 098°T at 7.9 kn until 1050, then 144°T at 5.5 kn until 1120.

   Give the 1120 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 1130 you fix your position 058°T, 3.2 nm from Heron Point Light. You steer 349°T at 5.3 kn until 1200, then 267°T at 8.6 kn until 1225.

   Give the 1225 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 0905 you fix your position 138°T, 2.5 nm from Tern Island tower. You steer 242°T at 10.0 kn until 0930, then 009°T at 7.3 kn until 0940.

   Give the 0940 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