Worksheet 516 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 095°T, 2.0 nm from Tern Island tower. You steer 184°T at 4.4 kn until 1220, then 059°T at 8.4 kn until 1230.

   Give the 1230 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 1505 you fix your position 088°T, 2.0 nm from Gannet Rock daybeacon. You steer 357°T at 5.7 kn until 1520, then 303°T at 7.3 kn until 1540.

   Give the 1540 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 1130 you fix your position 052°T, 2.8 nm from Westfield church spire. You steer 315°T at 4.9 kn until 1150, then 098°T at 5.5 kn until 1215.

   Give the 1215 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 1430 you fix your position 041°T, 3.9 nm from Gannet Rock daybeacon. You steer 200°T at 8.9 kn until 1505, then 295°T at 6.4 kn until 1515.

   Give the 1515 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 0830 you fix your position 290°T, 2.7 nm from Tern Island tower. You steer 156°T at 8.7 kn until 0850, then 087°T at 6.6 kn until 0910.

   Give the 0910 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  

6. At 0720 you fix your position 193°T, 2.0 nm from Gannet Rock daybeacon. You steer 043°T at 8.0 kn until 0755, then 337°T at 6.5 kn until 0825.

   Give the 0825 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  

7. At 1540 you fix your position 074°T, 2.5 nm from Westfield church spire. You steer 049°T at 5.2 kn until 1615, then 175°T at 7.5 kn until 1640.

   Give the 1640 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  

8. At 1145 you fix your position 077°T, 2.3 nm from Westfield church spire. You steer 241°T at 5.9 kn until 1155, then 133°T at 7.7 kn until 1240.

   Give the 1240 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