Worksheet 641 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 248°T, 3.5 nm from Tern Island tower. You steer 241°T at 5.6 kn until 0905, then 281°T at 5.9 kn until 0925.

   Give the 0925 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  

2. At 1355 you fix your position 023°T, 2.2 nm from Gannet Rock daybeacon. You steer 233°T at 5.7 kn until 1415, then 193°T at 4.0 kn until 1500.

   Give the 1500 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 1130 you fix your position 081°T, 2.8 nm from Tern Island tower. You steer 165°T at 7.1 kn until 1145, then 326°T at 9.9 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  

4. At 1225 you fix your position 006°T, 2.5 nm from Mill stack. You steer 147°T at 7.4 kn until 1235, then 280°T at 7.0 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  

5. At 1425 you fix your position 089°T, 2.5 nm from Tern Island tower. You steer 065°T at 5.8 kn until 1435, then 320°T at 4.6 kn until 1510.

   Give the 1510 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 1315 you fix your position 107°T, 2.1 nm from Westfield church spire. You steer 317°T at 7.3 kn until 1325, then 046°T at 6.7 kn until 1345.

   Give the 1345 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  

7. At 1250 you fix your position 031°T, 2.3 nm from Westfield church spire. You steer 104°T at 7.5 kn until 1330, then 249°T at 7.2 kn until 1355.

   Give the 1355 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  

8. At 1505 you fix your position 036°T, 2.5 nm from Mill stack. You steer 249°T at 4.2 kn until 1515, then 356°T at 8.2 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