Worksheet 546 · Skill 3

Dead reckoning

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1. At 0830 you fix your position 259°T, 1.8 nm from Gannet Rock daybeacon. You steer 187°T at 4.0 kn until 0855, then 047°T at 5.1 kn until 0920.

   Give the 0920 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  

2. At 1055 you fix your position 035°T, 1.7 nm from Heron Point Light. You steer 011°T at 8.7 kn until 1135, then 213°T at 7.5 kn until 1150.

   Give the 1150 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  

3. At 1340 you fix your position 069°T, 2.0 nm from Gannet Rock daybeacon. You steer 263°T at 9.2 kn until 1420, then 024°T at 5.9 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  

4. At 1005 you fix your position 069°T, 1.4 nm from Heron Point Light. You steer 056°T at 5.3 kn until 1045, then 324°T at 7.5 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 0800 you fix your position 299°T, 2.7 nm from Tern Island tower. You steer 159°T at 8.5 kn until 0810, then 003°T at 5.9 kn until 0830.

   Give the 0830 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  

6. At 0930 you fix your position 045°T, 2.9 nm from Westfield church spire. You steer 045°T at 7.1 kn until 0945, then 182°T at 4.2 kn until 1030.

   Give the 1030 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  

7. At 1040 you fix your position 057°T, 2.6 nm from Gannet Rock daybeacon. You steer 016°T at 8.0 kn until 1105, then 221°T at 4.9 kn until 1145.

   Give the 1145 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  

8. At 1150 you fix your position 257°T, 2.4 nm from Gannet Rock daybeacon. You steer 299°T at 7.8 kn until 1235, then 050°T at 8.0 kn until 1255.

   Give the 1255 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