Worksheet 687 · Skill 3

Dead reckoning

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1. At 0950 you fix your position 337°T, 1.4 nm from Gannet Rock daybeacon. You steer 074°T at 8.0 kn until 1015, then 278°T at 6.4 kn until 1030.

   Give the 1030 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 1055 you fix your position 065°T, 2.4 nm from Tern Island tower. You steer 195°T at 5.7 kn until 1105, then 075°T at 6.0 kn until 1125.

   Give the 1125 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 0920 you fix your position 295°T, 3.3 nm from Tern Island tower. You steer 221°T at 8.2 kn until 1000, then 030°T at 6.9 kn until 1025.

   Give the 1025 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 0925 you fix your position 056°T, 2.5 nm from Tern Island tower. You steer 272°T at 8.0 kn until 0945, then 224°T at 4.8 kn until 1025.

   Give the 1025 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 1255 you fix your position 070°T, 3.1 nm from Gannet Rock daybeacon. You steer 226°T at 6.0 kn until 1320, then 016°T at 9.7 kn until 1330.

   Give the 1330 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 1505 you fix your position 319°T, 2.0 nm from Tern Island tower. You steer 230°T at 7.6 kn until 1540, then 139°T at 5.1 kn until 1610.

   Give the 1610 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

7. At 1450 you fix your position 001°T, 1.7 nm from Mill stack. You steer 257°T at 5.7 kn until 1510, then 014°T at 7.4 kn until 1530.

   Give the 1530 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

8. At 1550 you fix your position 049°T, 2.9 nm from Tern Island tower. You steer 202°T at 6.2 kn until 1605, then 156°T at 4.2 kn until 1650.

   Give the 1650 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