Worksheet 24 · Skill 3

Dead reckoning

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1. At 1545 you fix your position 085°T, 3.7 nm from Westfield church spire. You steer 111°T at 9.4 kn until 1600, then 236°T at 6.9 kn until 1620.

   Give the 1620 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 1040 you fix your position 329°T, 2.4 nm from Mill stack. You steer 355°T at 7.1 kn until 1115, then 188°T at 9.2 kn until 1125.

   Give the 1125 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  

3. At 1440 you fix your position 315°T, 1.5 nm from Tern Island tower. You steer 208°T at 7.0 kn until 1510, then 131°T at 6.3 kn until 1540.

   Give the 1540 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

4. At 1355 you fix your position 040°T, 2.3 nm from Heron Point Light. You steer 299°T at 7.1 kn until 1410, then 083°T at 5.0 kn until 1430.

   Give the 1430 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 0700 you fix your position 316°T, 3.2 nm from Tern Island tower. You steer 234°T at 5.4 kn until 0710, then 274°T at 4.7 kn until 0755.

   Give the 0755 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 1340 you fix your position 099°T, 2.3 nm from Westfield church spire. You steer 037°T at 4.1 kn until 1400, then 156°T at 8.9 kn until 1410.

   Give the 1410 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 1225 you fix your position 255°T, 3.7 nm from Tern Island tower. You steer 127°T at 4.1 kn until 1245, then 215°T at 7.5 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  

8. At 0800 you fix your position 343°T, 1.7 nm from Mill stack. You steer 356°T at 6.6 kn until 0815, then 175°T at 4.5 kn until 0830.

   Give the 0830 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm