Worksheet 161 · Skill 3

Dead reckoning

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1. At 1345 you fix your position 005°T, 2.0 nm from Gannet Rock daybeacon. You steer 338°T at 9.2 kn until 1400, then 028°T at 4.3 kn until 1415.

   Give the 1415 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 1255 you fix your position 067°T, 1.1 nm from Heron Point Light. You steer 035°T at 9.4 kn until 1320, then 244°T at 4.8 kn until 1345.

   Give the 1345 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  

3. At 1235 you fix your position 256°T, 2.4 nm from Gannet Rock daybeacon. You steer 340°T at 5.6 kn until 1315, then 176°T at 6.2 kn until 1335.

   Give the 1335 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 1445 you fix your position 081°T, 2.9 nm from Westfield church spire. You steer 103°T at 5.4 kn until 1515, then 256°T at 4.3 kn until 1555.

   Give the 1555 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 0950 you fix your position 261°T, 2.8 nm from Gannet Rock daybeacon. You steer 078°T at 6.7 kn until 1005, then 029°T at 7.2 kn until 1045.

   Give the 1045 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 0905 you fix your position 046°T, 3.1 nm from Gannet Rock daybeacon. You steer 027°T at 4.3 kn until 0930, then 262°T at 4.9 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  

7. At 1550 you fix your position 089°T, 2.5 nm from Westfield church spire. You steer 080°T at 4.9 kn until 1630, then 283°T at 4.7 kn until 1650.

   Give the 1650 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  

8. At 0745 you fix your position 233°T, 1.7 nm from Tern Island tower. You steer 142°T at 8.3 kn until 0800, then 062°T at 9.6 kn until 0835.

   Give the 0835 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