Worksheet 756 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 279°T, 1.7 nm from Gannet Rock daybeacon. You steer 323°T at 5.1 kn until 1430, then 190°T at 8.9 kn until 1445.

   Give the 1445 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 1125 you fix your position 090°T, 3.7 nm from Westfield church spire. You steer 247°T at 4.9 kn until 1145, then 073°T at 9.7 kn until 1200.

   Give the 1200 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 1220 you fix your position 248°T, 3.3 nm from Tern Island tower. You steer 208°T at 4.7 kn until 1235, then 242°T at 5.2 kn until 1255.

   Give the 1255 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 0925 you fix your position 222°T, 2.4 nm from Tern Island tower. You steer 056°T at 4.5 kn until 0935, then 286°T at 4.4 kn until 1020.

   Give the 1020 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 1325 you fix your position 235°T, 1.6 nm from Tern Island tower. You steer 284°T at 4.7 kn until 1400, then 320°T at 6.0 kn until 1435.

   Give the 1435 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 1510 you fix your position 005°T, 3.2 nm from Westfield church spire. You steer 117°T at 5.6 kn until 1525, then 324°T at 7.0 kn until 1535.

   Give the 1535 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  

7. At 1515 you fix your position 206°T, 2.4 nm from Tern Island tower. You steer 116°T at 8.1 kn until 1555, then 353°T at 8.3 kn until 1615.

   Give the 1615 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 0920 you fix your position 145°T, 2.4 nm from Tern Island tower. You steer 233°T at 5.7 kn until 1005, then 020°T at 9.0 kn until 1015.

   Give the 1015 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