Worksheet 561 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 234°T, 2.0 nm from Gannet Rock daybeacon. You steer 230°T at 5.4 kn until 0745, then 017°T at 7.3 kn until 0805.

   Give the 0805 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 1215 you fix your position 156°T, 2.9 nm from Tern Island tower. You steer 033°T at 8.7 kn until 1245, then 106°T at 9.2 kn until 1255.

   Give the 1255 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  

3. At 1230 you fix your position 058°T, 3.3 nm from Westfield church spire. You steer 243°T at 4.4 kn until 1300, then 351°T at 6.7 kn until 1315.

   Give the 1315 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 1330 you fix your position 043°T, 2.6 nm from Gannet Rock daybeacon. You steer 322°T at 4.4 kn until 1345, then 225°T at 6.0 kn until 1420.

   Give the 1420 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 1410 you fix your position 032°T, 1.9 nm from Heron Point Light. You steer 325°T at 4.7 kn until 1440, then 187°T at 9.7 kn until 1455.

   Give the 1455 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  

6. At 0900 you fix your position 042°T, 4.6 nm from Westfield church spire. You steer 242°T at 4.7 kn until 0920, then 122°T at 6.9 kn until 0945.

   Give the 0945 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 1435 you fix your position 075°T, 1.0 nm from Heron Point Light. You steer 058°T at 7.3 kn until 1515, then 286°T at 6.6 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  

8. At 1250 you fix your position 254°T, 2.1 nm from Tern Island tower. You steer 258°T at 5.5 kn until 1310, then 320°T at 7.3 kn until 1335.

   Give the 1335 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