Worksheet 328 · Skill 3

Dead reckoning

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1. At 1100 you fix your position 048°T, 3.0 nm from Gannet Rock daybeacon. You steer 277°T at 7.6 kn until 1115, then 119°T at 6.5 kn until 1125.

   Give the 1125 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 1435 you fix your position 232°T, 2.7 nm from Tern Island tower. You steer 182°T at 5.1 kn until 1450, then 044°T at 9.8 kn until 1505.

   Give the 1505 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 1045 you fix your position 055°T, 2.5 nm from Westfield church spire. You steer 151°T at 7.8 kn until 1110, then 094°T at 7.6 kn until 1130.

   Give the 1130 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 0940 you fix your position 321°T, 3.2 nm from Tern Island tower. You steer 205°T at 7.6 kn until 1020, then 080°T at 6.3 kn until 1045.

   Give the 1045 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 1350 you fix your position 235°T, 1.4 nm from Tern Island tower. You steer 175°T at 5.3 kn until 1405, then 306°T at 7.3 kn until 1425.

   Give the 1425 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  

6. At 1235 you fix your position 355°T, 3.2 nm from Mill stack. You steer 350°T at 9.4 kn until 1305, then 282°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  

7. At 1005 you fix your position 353°T, 2.9 nm from Mill stack. You steer 017°T at 4.5 kn until 1045, then 308°T at 6.2 kn until 1110.

   Give the 1110 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 1520 you fix your position 048°T, 1.5 nm from Heron Point Light. You steer 035°T at 5.2 kn until 1600, then 158°T at 7.5 kn until 1625.

   Give the 1625 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