Worksheet 108 · Skill 3

Dead reckoning

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1. At 0850 you fix your position 011°T, 2.5 nm from Mill stack. You steer 357°T at 6.3 kn until 0925, then 164°T at 4.5 kn until 0955.

   Give the 0955 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 0715 you fix your position 002°T, 2.3 nm from Mill stack. You steer 351°T at 5.8 kn until 0730, then 131°T at 4.3 kn until 0740.

   Give the 0740 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 1105 you fix your position 030°T, 3.7 nm from Westfield church spire. You steer 172°T at 9.1 kn until 1135, then 128°T at 8.5 kn until 1150.

   Give the 1150 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  

4. At 1520 you fix your position 067°T, 1.5 nm from Heron Point Light. You steer 105°T at 6.4 kn until 1555, then 325°T at 4.7 kn until 1610.

   Give the 1610 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  

5. At 1210 you fix your position 262°T, 2.4 nm from Tern Island tower. You steer 271°T at 4.5 kn until 1235, then 168°T at 8.5 kn until 1310.

   Give the 1310 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 0955 you fix your position 115°T, 2.0 nm from Westfield church spire. You steer 025°T at 5.9 kn until 1020, then 154°T at 7.4 kn until 1035.

   Give the 1035 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 1305 you fix your position 043°T, 1.9 nm from Kittle water tank. You steer 270°T at 4.1 kn until 1330, then 094°T at 5.1 kn until 1350.

   Give the 1350 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 1500 you fix your position 260°T, 3.5 nm from Tern Island tower. You steer 233°T at 4.5 kn until 1525, then 055°T at 6.6 kn until 1540.

   Give the 1540 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