Worksheet 145 · Skill 3

Dead reckoning

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1. At 0905 you fix your position 134°T, 2.7 nm from Tern Island tower. You steer 014°T at 9.6 kn until 0915, then 143°T at 4.7 kn until 0945.

   Give the 0945 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  

2. At 0835 you fix your position 105°T, 1.7 nm from Gannet Rock daybeacon. You steer 345°T at 4.5 kn until 0915, then 222°T at 4.9 kn until 0940.

   Give the 0940 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 1515 you fix your position 069°T, 4.9 nm from Tern Island tower. You steer 286°T at 6.2 kn until 1540, then 243°T at 6.0 kn until 1600.

   Give the 1600 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 256°T, 3.7 nm from Tern Island tower. You steer 147°T at 4.9 kn until 1200, then 030°T at 7.6 kn until 1235.

   Give the 1235 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 1310 you fix your position 052°T, 3.5 nm from Gannet Rock daybeacon. You steer 178°T at 5.7 kn until 1330, then 277°T at 4.1 kn until 1400.

   Give the 1400 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  

6. At 1110 you fix your position 053°T, 1.1 nm from Heron Point Light. You steer 338°T at 4.1 kn until 1140, then 137°T at 5.5 kn until 1155.

   Give the 1155 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 1200 you fix your position 218°T, 3.3 nm from Tern Island tower. You steer 337°T at 5.2 kn until 1215, then 195°T at 5.0 kn until 1300.

   Give the 1300 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 1130 you fix your position 034°T, 3.6 nm from Heron Point Light. You steer 287°T at 8.6 kn until 1150, then 337°T at 4.1 kn until 1230.

   Give the 1230 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