Worksheet 778 · Skill 3

Dead reckoning

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1. At 0920 you fix your position 229°T, 2.7 nm from Tern Island tower. You steer 106°T at 9.9 kn until 0935, then 312°T at 7.4 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  

2. At 1415 you fix your position 080°T, 2.4 nm from Westfield church spire. You steer 037°T at 6.8 kn until 1430, then 309°T at 5.1 kn until 1500.

   Give the 1500 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 1210 you fix your position 037°T, 2.1 nm from Heron Point Light. You steer 129°T at 5.5 kn until 1220, then 057°T at 7.5 kn until 1240.

   Give the 1240 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 1140 you fix your position 343°T, 2.8 nm from Kittle water tank. You steer 108°T at 7.4 kn until 1155, then 206°T at 6.1 kn until 1210.

   Give the 1210 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  

5. At 1000 you fix your position 046°T, 3.5 nm from Westfield church spire. You steer 078°T at 7.3 kn until 1030, then 182°T at 4.6 kn until 1115.

   Give the 1115 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 1340 you fix your position 290°T, 3.0 nm from Tern Island tower. You steer 222°T at 4.0 kn until 1410, then 011°T at 6.2 kn until 1435.

   Give the 1435 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 0945 you fix your position 038°T, 2.3 nm from Tern Island tower. You steer 140°T at 5.5 kn until 1025, then 352°T at 7.3 kn until 1035.

   Give the 1035 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 1010 you fix your position 080°T, 2.9 nm from Tern Island tower. You steer 293°T at 6.3 kn until 1055, then 188°T at 4.5 kn until 1135.

   Give the 1135 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