Worksheet 68 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 038°T, 2.0 nm from Westfield church spire. You steer 129°T at 4.7 kn until 1130, then 164°T at 7.6 kn until 1205.

   Give the 1205 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  

2. At 0910 you fix your position 316°T, 2.9 nm from Tern Island tower. You steer 159°T at 5.2 kn until 0920, then 070°T at 7.6 kn until 0935.

   Give the 0935 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 1240 you fix your position 064°T, 3.3 nm from Westfield church spire. You steer 128°T at 9.2 kn until 1255, then 092°T at 5.1 kn until 1320.

   Give the 1320 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 1410 you fix your position 015°T, 1.4 nm from Heron Point Light. You steer 129°T at 5.3 kn until 1440, then 325°T at 8.2 kn until 1505.

   Give the 1505 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  

5. At 0855 you fix your position 266°T, 3.5 nm from Tern Island tower. You steer 211°T at 4.9 kn until 0905, then 096°T at 8.2 kn until 0930.

   Give the 0930 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 1045 you fix your position 049°T, 1.7 nm from Kittle water tank. You steer 321°T at 7.8 kn until 1110, then 115°T at 6.4 kn until 1130.

   Give the 1130 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  

7. At 1010 you fix your position 279°T, 2.4 nm from Tern Island tower. You steer 272°T at 5.9 kn until 1020, then 213°T at 8.0 kn until 1050.

   Give the 1050 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 0945 you fix your position 352°T, 3.4 nm from Mill stack. You steer 061°T at 6.0 kn until 1000, then 269°T at 8.6 kn until 1035.

   Give the 1035 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