Worksheet 648 · Skill 3

Dead reckoning

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1. At 1205 you fix your position 225°T, 3.3 nm from Tern Island tower. You steer 282°T at 5.9 kn until 1235, then 147°T at 4.3 kn until 1255.

   Give the 1255 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  

2. At 1240 you fix your position 053°T, 2.5 nm from Gannet Rock daybeacon. You steer 316°T at 8.8 kn until 1250, then 171°T at 6.9 kn until 1315.

   Give the 1315 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 1530 you fix your position 331°T, 1.3 nm from Gannet Rock daybeacon. You steer 199°T at 4.7 kn until 1540, then 023°T at 4.7 kn until 1610.

   Give the 1610 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 1220 you fix your position 004°T, 1.1 nm from Gannet Rock daybeacon. You steer 346°T at 7.8 kn until 1240, then 145°T at 7.4 kn until 1320.

   Give the 1320 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 1245 you fix your position 272°T, 3.6 nm from Tern Island tower. You steer 052°T at 7.3 kn until 1315, then 096°T at 4.6 kn until 1330.

   Give the 1330 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 1330 you fix your position 002°T, 1.7 nm from Mill stack. You steer 099°T at 8.9 kn until 1350, then 356°T at 7.7 kn until 1410.

   Give the 1410 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 1025 you fix your position 008°T, 3.0 nm from Mill stack. You steer 203°T at 8.8 kn until 1035, then 075°T at 5.6 kn until 1100.

   Give the 1100 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 0945 you fix your position 280°T, 3.4 nm from Tern Island tower. You steer 239°T at 8.3 kn until 1000, then 293°T at 5.2 kn until 1015.

   Give the 1015 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