Worksheet 545 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 073°T, 3.5 nm from Tern Island tower. You steer 199°T at 9.6 kn until 0750, then 148°T at 6.3 kn until 0800.

   Give the 0800 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  

2. At 1345 you fix your position 177°T, 1.3 nm from Tern Island tower. You steer 191°T at 9.7 kn until 1355, then 259°T at 8.0 kn until 1405.

   Give the 1405 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  

3. At 0800 you fix your position 287°T, 2.9 nm from Tern Island tower. You steer 085°T at 5.5 kn until 0825, then 284°T at 8.2 kn until 0850.

   Give the 0850 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 1425 you fix your position 069°T, 3.3 nm from Tern Island tower. You steer 178°T at 6.5 kn until 1445, then 120°T at 5.2 kn until 1510.

   Give the 1510 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  

5. At 1350 you fix your position 087°T, 2.2 nm from Westfield church spire. You steer 031°T at 7.6 kn until 1415, then 081°T at 4.2 kn until 1425.

   Give the 1425 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 1410 you fix your position 042°T, 3.5 nm from Westfield church spire. You steer 264°T at 4.7 kn until 1425, then 210°T at 4.6 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  

7. At 1405 you fix your position 042°T, 2.2 nm from Kittle water tank. You steer 322°T at 7.0 kn until 1445, then 143°T at 4.9 kn until 1510.

   Give the 1510 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 1215 you fix your position 069°T, 3.7 nm from Westfield church spire. You steer 125°T at 8.1 kn until 1230, then 176°T at 4.0 kn until 1255.

   Give the 1255 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