Worksheet 796 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 305°T, 2.6 nm from Tern Island tower. You steer 266°T at 8.5 kn until 1310, then 158°T at 5.4 kn until 1330.

   Give the 1330 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  

2. At 0940 you fix your position 099°T, 2.4 nm from Gannet Rock daybeacon. You steer 008°T at 9.3 kn until 1005, then 196°T at 7.0 kn until 1015.

   Give the 1015 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 0740 you fix your position 333°T, 1.4 nm from Tern Island tower. You steer 231°T at 4.9 kn until 0825, then 030°T at 6.8 kn until 0900.

   Give the 0900 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 1455 you fix your position 304°T, 2.3 nm from Tern Island tower. You steer 279°T at 6.2 kn until 1540, then 133°T at 7.2 kn until 1620.

   Give the 1620 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 1215 you fix your position 283°T, 3.9 nm from Tern Island tower. You steer 150°T at 4.4 kn until 1300, then 292°T at 7.4 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  

6. At 1440 you fix your position 035°T, 0.8 nm from Gannet Rock daybeacon. You steer 138°T at 6.1 kn until 1505, then 002°T at 10.0 kn until 1530.

   Give the 1530 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 1405 you fix your position 094°T, 3.2 nm from Westfield church spire. You steer 134°T at 4.6 kn until 1435, then 351°T at 7.5 kn until 1500.

   Give the 1500 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 1345 you fix your position 032°T, 3.8 nm from Westfield church spire. You steer 138°T at 6.4 kn until 1400, then 084°T at 9.2 kn until 1415.

   Give the 1415 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