Worksheet 262 · Skill 3

Dead reckoning

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1. At 0710 you fix your position 355°T, 2.6 nm from Mill stack. You steer 341°T at 7.4 kn until 0735, then 128°T at 8.1 kn until 0750.

   Give the 0750 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 1335 you fix your position 249°T, 1.3 nm from Gannet Rock daybeacon. You steer 318°T at 7.5 kn until 1405, then 242°T at 7.0 kn until 1445.

   Give the 1445 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 1410 you fix your position 224°T, 2.3 nm from Gannet Rock daybeacon. You steer 248°T at 4.7 kn until 1435, then 014°T at 8.2 kn until 1450.

   Give the 1450 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 0725 you fix your position 269°T, 2.4 nm from Tern Island tower. You steer 166°T at 8.6 kn until 0735, then 273°T at 4.8 kn until 0800.

   Give the 0800 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  

5. At 0935 you fix your position 183°T, 1.4 nm from Tern Island tower. You steer 250°T at 5.2 kn until 1015, then 317°T at 7.8 kn until 1035.

   Give the 1035 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  

6. At 1430 you fix your position 094°T, 2.4 nm from Westfield church spire. You steer 235°T at 7.1 kn until 1440, then 098°T at 6.9 kn until 1500.

   Give the 1500 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  

7. At 0850 you fix your position 066°T, 1.6 nm from Gannet Rock daybeacon. You steer 197°T at 5.1 kn until 0900, then 092°T at 8.0 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  

8. At 1430 you fix your position 354°T, 1.7 nm from Heron Point Light. You steer 126°T at 8.0 kn until 1445, then 054°T at 4.9 kn until 1530.

   Give the 1530 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