Worksheet 92 · Skill 3

Dead reckoning

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1. At 0840 you fix your position 220°T, 3.2 nm from Tern Island tower. You steer 323°T at 6.4 kn until 0920, then 088°T at 6.6 kn until 0935.

   Give the 0935 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  

2. At 1310 you fix your position 232°T, 1.8 nm from Tern Island tower. You steer 149°T at 7.9 kn until 1320, then 333°T at 5.6 kn until 1355.

   Give the 1355 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 1405 you fix your position 041°T, 2.5 nm from Westfield church spire. You steer 342°T at 7.6 kn until 1420, then 173°T at 7.8 kn until 1440.

   Give the 1440 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 1030 you fix your position 298°T, 3.4 nm from Tern Island tower. You steer 189°T at 4.6 kn until 1110, then 027°T at 5.1 kn until 1155.

   Give the 1155 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 1235 you fix your position 111°T, 2.1 nm from Gannet Rock daybeacon. You steer 215°T at 7.2 kn until 1250, then 301°T at 6.1 kn until 1325.

   Give the 1325 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 0810 you fix your position 275°T, 1.2 nm from Gannet Rock daybeacon. You steer 267°T at 9.7 kn until 0825, then 343°T at 8.7 kn until 0855.

   Give the 0855 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 1325 you fix your position 092°T, 2.4 nm from Gannet Rock daybeacon. You steer 031°T at 8.9 kn until 1335, then 277°T at 7.4 kn until 1400.

   Give the 1400 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 1535 you fix your position 077°T, 2.8 nm from Westfield church spire. You steer 197°T at 5.6 kn until 1545, then 313°T at 5.3 kn until 1555.

   Give the 1555 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