Worksheet 76 · Skill 3

Dead reckoning

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1. At 1545 you fix your position 270°T, 1.7 nm from Tern Island tower. You steer 297°T at 6.0 kn until 1620, then 165°T at 8.0 kn until 1700.

   Give the 1700 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 0740 you fix your position 255°T, 3.3 nm from Tern Island tower. You steer 266°T at 6.5 kn until 0750, then 332°T at 5.1 kn until 0805.

   Give the 0805 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 0815 you fix your position 252°T, 2.6 nm from Tern Island tower. You steer 147°T at 6.8 kn until 0850, then 268°T at 7.4 kn until 0920.

   Give the 0920 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  

4. At 1325 you fix your position 277°T, 2.0 nm from Tern Island tower. You steer 287°T at 6.0 kn until 1400, then 185°T at 6.3 kn until 1430.

   Give the 1430 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 1545 you fix your position 073°T, 2.7 nm from Westfield church spire. You steer 298°T at 4.9 kn until 1555, then 132°T at 4.8 kn until 1620.

   Give the 1620 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 1145 you fix your position 037°T, 3.6 nm from Westfield church spire. You steer 199°T at 7.2 kn until 1205, then 152°T at 7.7 kn until 1235.

   Give the 1235 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 0700 you fix your position 057°T, 3.1 nm from Westfield church spire. You steer 072°T at 4.5 kn until 0715, then 244°T at 6.3 kn until 0745.

   Give the 0745 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 1505 you fix your position 143°T, 1.8 nm from Westfield church spire. You steer 074°T at 6.3 kn until 1550, then 015°T at 8.2 kn until 1615.

   Give the 1615 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