Worksheet 767 · Skill 3

Dead reckoning

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1. At 1300 you fix your position 339°T, 2.7 nm from Mill stack. You steer 284°T at 8.1 kn until 1320, then 028°T at 6.3 kn until 1350.

   Give the 1350 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 0845 you fix your position 070°T, 2.5 nm from Tern Island tower. You steer 196°T at 9.0 kn until 0900, then 254°T at 8.2 kn until 0925.

   Give the 0925 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 0730 you fix your position 042°T, 3.3 nm from Tern Island tower. You steer 253°T at 9.0 kn until 0805, then 038°T at 4.9 kn until 0820.

   Give the 0820 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 0715 you fix your position 071°T, 2.5 nm from Heron Point Light. You steer 156°T at 7.7 kn until 0725, then 002°T at 4.5 kn until 0800.

   Give the 0800 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 1040 you fix your position 253°T, 1.3 nm from Gannet Rock daybeacon. You steer 189°T at 8.3 kn until 1055, then 257°T at 8.9 kn until 1110.

   Give the 1110 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  

6. At 1410 you fix your position 352°T, 2.4 nm from Mill stack. You steer 219°T at 6.4 kn until 1425, then 303°T at 4.6 kn until 1510.

   Give the 1510 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 1005 you fix your position 347°T, 1.0 nm from Gannet Rock daybeacon. You steer 038°T at 8.7 kn until 1020, then 187°T at 8.6 kn until 1055.

   Give the 1055 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  

8. At 1130 you fix your position 049°T, 4.0 nm from Westfield church spire. You steer 204°T at 5.2 kn until 1215, then 087°T at 8.0 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