Worksheet 247 · Skill 3

Dead reckoning

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1. At 1135 you fix your position 035°T, 3.9 nm from Westfield church spire. You steer 124°T at 9.3 kn until 1200, then 170°T at 8.4 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  

2. At 1205 you fix your position 008°T, 1.7 nm from Heron Point Light. You steer 011°T at 5.3 kn until 1215, then 097°T at 6.1 kn until 1300.

   Give the 1300 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  

3. At 1130 you fix your position 079°T, 1.2 nm from Heron Point Light. You steer 044°T at 6.1 kn until 1215, then 261°T at 9.2 kn until 1240.

   Give the 1240 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  

4. At 1210 you fix your position 290°T, 2.7 nm from Tern Island tower. You steer 155°T at 9.8 kn until 1235, then 232°T at 7.9 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  

5. At 1300 you fix your position 095°T, 2.0 nm from Heron Point Light. You steer 086°T at 6.3 kn until 1330, then 285°T at 9.4 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  

6. At 0700 you fix your position 298°T, 3.4 nm from Tern Island tower. You steer 220°T at 5.3 kn until 0745, then 033°T at 9.3 kn until 0815.

   Give the 0815 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 0820 you fix your position 199°T, 1.3 nm from Tern Island tower. You steer 135°T at 5.6 kn until 0905, then 012°T at 5.2 kn until 0925.

   Give the 0925 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 0700 you fix your position 274°T, 3.1 nm from Tern Island tower. You steer 213°T at 6.4 kn until 0720, then 326°T at 4.5 kn until 0735.

   Give the 0735 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