Worksheet 429 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 084°T, 2.9 nm from Gannet Rock daybeacon. You steer 309°T at 8.4 kn until 1045, then 053°T at 4.3 kn until 1110.

   Give the 1110 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 1130 you fix your position 240°T, 3.5 nm from Tern Island tower. You steer 105°T at 9.3 kn until 1155, then 035°T at 6.5 kn until 1230.

   Give the 1230 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 1550 you fix your position 282°T, 3.1 nm from Tern Island tower. You steer 268°T at 7.8 kn until 1620, then 125°T at 4.0 kn until 1640.

   Give the 1640 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  

4. At 1335 you fix your position 315°T, 2.5 nm from Tern Island tower. You steer 237°T at 8.1 kn until 1345, then 085°T at 7.5 kn until 1425.

   Give the 1425 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 1115 you fix your position 041°T, 1.7 nm from Heron Point Light. You steer 353°T at 6.0 kn until 1150, then 094°T at 8.2 kn until 1205.

   Give the 1205 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 1205 you fix your position 169°T, 1.1 nm from Gannet Rock daybeacon. You steer 299°T at 9.8 kn until 1230, then 336°T at 7.3 kn until 1300.

   Give the 1300 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 0740 you fix your position 307°T, 3.0 nm from Tern Island tower. You steer 227°T at 6.5 kn until 0805, then 052°T at 6.0 kn until 0845.

   Give the 0845 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 0805 you fix your position 265°T, 2.8 nm from Tern Island tower. You steer 308°T at 5.3 kn until 0835, then 141°T at 5.7 kn until 0915.

   Give the 0915 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