Worksheet 411 · Skill 3

Dead reckoning

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1. At 1500 you fix your position 069°T, 2.7 nm from Westfield church spire. You steer 297°T at 4.3 kn until 1515, then 065°T at 5.6 kn until 1535.

   Give the 1535 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 1555 you fix your position 112°T, 2.1 nm from Gannet Rock daybeacon. You steer 340°T at 8.4 kn until 1625, then 066°T at 6.8 kn until 1635.

   Give the 1635 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 0925 you fix your position 319°T, 2.6 nm from Tern Island tower. You steer 095°T at 5.5 kn until 0955, then 279°T at 5.0 kn until 1010.

   Give the 1010 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 1525 you fix your position 070°T, 1.4 nm from Gannet Rock daybeacon. You steer 295°T at 9.3 kn until 1535, then 041°T at 10.0 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  

5. At 1145 you fix your position 037°T, 1.0 nm from Gannet Rock daybeacon. You steer 017°T at 4.5 kn until 1155, then 110°T at 6.5 kn until 1205.

   Give the 1205 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 1205 you fix your position 058°T, 4.5 nm from Tern Island tower. You steer 118°T at 4.4 kn until 1215, then 270°T at 8.2 kn until 1225.

   Give the 1225 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 1215 you fix your position 032°T, 2.6 nm from Heron Point Light. You steer 340°T at 7.2 kn until 1250, then 131°T at 8.1 kn until 1305.

   Give the 1305 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 1140 you fix your position 264°T, 2.2 nm from Gannet Rock daybeacon. You steer 281°T at 4.1 kn until 1225, then 007°T at 6.9 kn until 1250.

   Give the 1250 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