Worksheet 791 · Skill 3

Dead reckoning

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1. At 0925 you fix your position 136°T, 1.7 nm from Westfield church spire. You steer 099°T at 10.0 kn until 0950, then 290°T at 7.1 kn until 1005.

   Give the 1005 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  

2. At 1145 you fix your position 045°T, 1.8 nm from Tern Island tower. You steer 099°T at 4.5 kn until 1200, then 280°T at 10.0 kn until 1210.

   Give the 1210 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 0850 you fix your position 163°T, 1.1 nm from Gannet Rock daybeacon. You steer 054°T at 4.2 kn until 0900, then 346°T at 9.7 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  

4. At 1525 you fix your position 074°T, 2.7 nm from Westfield church spire. You steer 105°T at 8.9 kn until 1535, then 339°T at 8.1 kn until 1545.

   Give the 1545 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 1350 you fix your position 322°T, 1.3 nm from Tern Island tower. You steer 315°T at 4.3 kn until 1400, then 122°T at 4.8 kn until 1410.

   Give the 1410 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 1445 you fix your position 040°T, 3.6 nm from Westfield church spire. You steer 151°T at 6.4 kn until 1520, then 335°T at 7.1 kn until 1545.

   Give the 1545 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 1535 you fix your position 141°T, 1.5 nm from Westfield church spire. You steer 098°T at 8.6 kn until 1555, then 034°T at 4.7 kn until 1630.

   Give the 1630 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 1535 you fix your position 288°T, 3.8 nm from Tern Island tower. You steer 251°T at 7.2 kn until 1555, then 021°T at 8.7 kn until 1605.

   Give the 1605 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