Worksheet 716 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 054°T, 3.1 nm from Gannet Rock daybeacon. You steer 247°T at 6.6 kn until 1155, then 206°T at 4.2 kn until 1225.

   Give the 1225 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 0725 you fix your position 075°T, 2.7 nm from Westfield church spire. You steer 323°T at 4.6 kn until 0800, then 185°T at 5.2 kn until 0815.

   Give the 0815 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 1515 you fix your position 260°T, 2.8 nm from Tern Island tower. You steer 206°T at 4.2 kn until 1550, then 021°T at 6.5 kn until 1630.

   Give the 1630 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 1045 you fix your position 087°T, 3.3 nm from Westfield church spire. You steer 004°T at 10.0 kn until 1105, then 106°T at 10.0 kn until 1125.

   Give the 1125 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 1200 you fix your position 265°T, 2.8 nm from Tern Island tower. You steer 016°T at 8.8 kn until 1215, then 280°T at 5.9 kn until 1230.

   Give the 1230 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 1445 you fix your position 033°T, 3.9 nm from Gannet Rock daybeacon. You steer 184°T at 7.9 kn until 1515, then 075°T at 6.1 kn until 1525.

   Give the 1525 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  

7. At 0745 you fix your position 148°T, 2.5 nm from Tern Island tower. You steer 283°T at 4.2 kn until 0800, then 058°T at 4.6 kn until 0820.

   Give the 0820 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 0910 you fix your position 047°T, 2.7 nm from Westfield church spire. You steer 278°T at 5.4 kn until 0920, then 108°T at 7.3 kn until 1005.

   Give the 1005 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