Worksheet 770 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 268°T, 3.2 nm from Tern Island tower. You steer 175°T at 4.3 kn until 1305, then 349°T at 7.8 kn until 1340.

   Give the 1340 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 1100 you fix your position 010°T, 2.9 nm from Mill stack. You steer 120°T at 4.0 kn until 1110, then 278°T at 7.8 kn until 1135.

   Give the 1135 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 0700 you fix your position 080°T, 3.2 nm from Westfield church spire. You steer 318°T at 5.1 kn until 0725, then 166°T at 5.5 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  

4. At 1405 you fix your position 353°T, 2.5 nm from Tern Island tower. You steer 098°T at 5.6 kn until 1425, then 263°T at 4.9 kn until 1435.

   Give the 1435 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  

5. At 0700 you fix your position 015°T, 2.4 nm from Mill stack. You steer 062°T at 8.3 kn until 0720, then 020°T at 8.0 kn until 0800.

   Give the 0800 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 1230 you fix your position 280°T, 3.4 nm from Tern Island tower. You steer 185°T at 5.0 kn until 1315, then 101°T at 8.4 kn until 1325.

   Give the 1325 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  

7. At 0800 you fix your position 042°T, 1.6 nm from Westfield church spire. You steer 333°T at 4.7 kn until 0815, then 135°T at 5.9 kn until 0855.

   Give the 0855 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 0720 you fix your position 101°T, 2.2 nm from Westfield church spire. You steer 253°T at 7.1 kn until 0730, then 062°T at 7.7 kn until 0810.

   Give the 0810 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