Worksheet 737 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 067°T, 4.3 nm from Tern Island tower. You steer 210°T at 8.4 kn until 1525, then 007°T at 7.0 kn until 1535.

   Give the 1535 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 1335 you fix your position 120°T, 1.8 nm from Westfield church spire. You steer 113°T at 4.9 kn until 1345, then 081°T at 8.0 kn until 1410.

   Give the 1410 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 1335 you fix your position 119°T, 2.0 nm from Westfield church spire. You steer 042°T at 5.3 kn until 1405, then 190°T at 8.6 kn until 1435.

   Give the 1435 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  

4. At 1305 you fix your position 040°T, 1.9 nm from Heron Point Light. You steer 327°T at 6.8 kn until 1335, then 117°T at 7.4 kn until 1405.

   Give the 1405 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 1435 you fix your position 067°T, 3.5 nm from Westfield church spire. You steer 054°T at 7.1 kn until 1455, then 238°T at 6.3 kn until 1515.

   Give the 1515 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 0700 you fix your position 340°T, 2.5 nm from Tern Island tower. You steer 260°T at 4.1 kn until 0725, then 208°T at 8.5 kn until 0745.

   Give the 0745 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 1255 you fix your position 264°T, 3.0 nm from Gannet Rock daybeacon. You steer 190°T at 6.3 kn until 1315, then 066°T at 8.4 kn until 1335.

   Give the 1335 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 1420 you fix your position 086°T, 2.6 nm from Westfield church spire. You steer 076°T at 6.4 kn until 1430, then 276°T at 4.7 kn until 1450.

   Give the 1450 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