Worksheet 785 · Skill 3

Dead reckoning

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1. At 1535 you fix your position 077°T, 3.4 nm from Tern Island tower. You steer 186°T at 6.3 kn until 1610, then 052°T at 4.4 kn until 1640.

   Give the 1640 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 0830 you fix your position 065°T, 2.8 nm from Heron Point Light. You steer 254°T at 4.4 kn until 0855, then 343°T at 8.5 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  

3. At 0805 you fix your position 127°T, 1.7 nm from Gannet Rock daybeacon. You steer 344°T at 5.2 kn until 0845, then 216°T at 8.4 kn until 0905.

   Give the 0905 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  

4. At 0820 you fix your position 356°T, 2.6 nm from Mill stack. You steer 088°T at 9.6 kn until 0855, then 017°T at 9.5 kn until 0910.

   Give the 0910 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 1205 you fix your position 051°T, 0.8 nm from Gannet Rock daybeacon. You steer 313°T at 4.7 kn until 1220, then 238°T at 6.4 kn until 1235.

   Give the 1235 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 1040 you fix your position 037°T, 1.2 nm from Westfield church spire. You steer 137°T at 8.3 kn until 1105, then 341°T at 5.2 kn until 1135.

   Give the 1135 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 1140 you fix your position 098°T, 2.6 nm from Westfield church spire. You steer 085°T at 4.0 kn until 1225, then 142°T at 4.1 kn until 1245.

   Give the 1245 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 1310 you fix your position 094°T, 1.9 nm from Westfield church spire. You steer 007°T at 6.2 kn until 1325, then 329°T at 5.9 kn until 1350.

   Give the 1350 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