Worksheet 46 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 333°T, 1.4 nm from Gannet Rock daybeacon. You steer 038°T at 5.2 kn until 1055, then 233°T at 4.5 kn until 1105.

   Give the 1105 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  

2. At 0940 you fix your position 286°T, 3.5 nm from Tern Island tower. You steer 181°T at 6.4 kn until 1000, then 115°T at 8.4 kn until 1020.

   Give the 1020 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 1105 you fix your position 092°T, 2.6 nm from Westfield church spire. You steer 120°T at 7.9 kn until 1125, then 063°T at 6.5 kn until 1155.

   Give the 1155 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 0835 you fix your position 051°T, 2.3 nm from Heron Point Light. You steer 073°T at 8.7 kn until 0905, then 298°T at 7.2 kn until 0915.

   Give the 0915 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 1550 you fix your position 029°T, 2.6 nm from Mill stack. You steer 260°T at 4.9 kn until 1605, then 002°T at 7.4 kn until 1615.

   Give the 1615 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 1110 you fix your position 106°T, 1.1 nm from Westfield church spire. You steer 093°T at 9.7 kn until 1125, then 040°T at 4.2 kn until 1210.

   Give the 1210 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 1410 you fix your position 323°T, 1.5 nm from Kittle water tank. You steer 326°T at 9.6 kn until 1430, then 261°T at 9.9 kn until 1440.

   Give the 1440 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  

8. At 0820 you fix your position 085°T, 2.6 nm from Westfield church spire. You steer 132°T at 7.5 kn until 0850, then 333°T at 7.5 kn until 0925.

   Give the 0925 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