Worksheet 442 · Skill 3

Dead reckoning

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1. At 0735 you fix your position 036°T, 3.5 nm from Heron Point Light. You steer 148°T at 4.8 kn until 0815, then 240°T at 4.0 kn until 0840.

   Give the 0840 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  

2. At 1210 you fix your position 067°T, 3.3 nm from Tern Island tower. You steer 155°T at 4.4 kn until 1245, then 312°T at 6.6 kn until 1330.

   Give the 1330 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 1035 you fix your position 209°T, 2.1 nm from Gannet Rock daybeacon. You steer 048°T at 7.1 kn until 1120, then 321°T at 4.3 kn until 1155.

   Give the 1155 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  

4. At 1055 you fix your position 011°T, 2.8 nm from Westfield church spire. You steer 101°T at 5.4 kn until 1115, then 322°T at 6.9 kn until 1125.

   Give the 1125 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 1540 you fix your position 246°T, 3.0 nm from Tern Island tower. You steer 023°T at 6.0 kn until 1600, then 318°T at 4.8 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  

6. At 0820 you fix your position 276°T, 1.6 nm from Tern Island tower. You steer 285°T at 6.1 kn until 0850, then 039°T at 5.6 kn until 0905.

   Give the 0905 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 0725 you fix your position 107°T, 2.2 nm from Westfield church spire. You steer 064°T at 8.0 kn until 0735, then 152°T at 7.8 kn until 0805.

   Give the 0805 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  

8. At 1155 you fix your position 351°T, 3.4 nm from Mill stack. You steer 014°T at 5.6 kn until 1230, then 343°T at 6.8 kn until 1240.

   Give the 1240 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