Worksheet 250 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 010°T, 2.2 nm from Tern Island tower. You steer 264°T at 4.1 kn until 1440, then 174°T at 5.2 kn until 1505.

   Give the 1505 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 0725 you fix your position 030°T, 3.7 nm from Gannet Rock daybeacon. You steer 035°T at 4.4 kn until 0750, then 263°T at 9.4 kn until 0805.

   Give the 0805 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 0855 you fix your position 239°T, 3.3 nm from Tern Island tower. You steer 125°T at 6.4 kn until 0920, then 292°T at 8.5 kn until 0935.

   Give the 0935 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 1525 you fix your position 036°T, 3.3 nm from Heron Point Light. You steer 290°T at 5.3 kn until 1535, then 084°T at 6.8 kn until 1605.

   Give the 1605 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 1540 you fix your position 012°T, 2.3 nm from Mill stack. You steer 346°T at 5.7 kn until 1625, then 301°T at 8.2 kn until 1640.

   Give the 1640 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 1405 you fix your position 079°T, 2.3 nm from Westfield church spire. You steer 067°T at 6.9 kn until 1415, then 218°T at 6.2 kn until 1445.

   Give the 1445 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 0840 you fix your position 188°T, 1.8 nm from Gannet Rock daybeacon. You steer 310°T at 5.4 kn until 0910, then 255°T at 7.6 kn until 0925.

   Give the 0925 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 1235 you fix your position 213°T, 1.9 nm from Tern Island tower. You steer 269°T at 4.8 kn until 1310, then 109°T at 6.9 kn until 1355.

   Give the 1355 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