Worksheet 313 · Skill 3

Dead reckoning

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1. At 0835 you fix your position 248°T, 2.7 nm from Tern Island tower. You steer 328°T at 5.2 kn until 0850, then 270°T at 8.3 kn until 0900.

   Give the 0900 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 1215 you fix your position 238°T, 3.4 nm from Tern Island tower. You steer 142°T at 6.0 kn until 1240, then 327°T at 5.9 kn until 1315.

   Give the 1315 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 1455 you fix your position 000°T, 1.8 nm from Heron Point Light. You steer 063°T at 8.9 kn until 1520, then 212°T at 9.0 kn until 1530.

   Give the 1530 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 1440 you fix your position 283°T, 3.8 nm from Tern Island tower. You steer 143°T at 8.9 kn until 1525, then 261°T at 4.0 kn until 1610.

   Give the 1610 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  

5. At 0720 you fix your position 048°T, 1.7 nm from Westfield church spire. You steer 173°T at 4.4 kn until 0755, then 016°T at 7.2 kn until 0805.

   Give the 0805 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 1035 you fix your position 127°T, 1.5 nm from Tern Island tower. You steer 245°T at 8.3 kn until 1110, then 318°T at 5.4 kn until 1120.

   Give the 1120 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  

7. At 1415 you fix your position 263°T, 2.8 nm from Gannet Rock daybeacon. You steer 096°T at 4.0 kn until 1445, then 157°T at 7.3 kn until 1500.

   Give the 1500 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

8. At 1210 you fix your position 054°T, 2.2 nm from Heron Point Light. You steer 081°T at 8.4 kn until 1220, then 306°T at 8.6 kn until 1230.

   Give the 1230 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