Worksheet 304 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 300°T, 3.2 nm from Tern Island tower. You steer 280°T at 9.1 kn until 0805, then 092°T at 5.1 kn until 0830.

   Give the 0830 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 1450 you fix your position 147°T, 1.5 nm from Tern Island tower. You steer 165°T at 8.5 kn until 1510, then 291°T at 6.0 kn until 1525.

   Give the 1525 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 1435 you fix your position 055°T, 1.5 nm from Westfield church spire. You steer 120°T at 8.2 kn until 1455, then 266°T at 8.8 kn until 1510.

   Give the 1510 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 1025 you fix your position 087°T, 2.9 nm from Tern Island tower. You steer 064°T at 4.1 kn until 1100, then 351°T at 6.0 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  

5. At 1115 you fix your position 042°T, 2.2 nm from Heron Point Light. You steer 029°T at 7.2 kn until 1135, then 248°T at 8.3 kn until 1200.

   Give the 1200 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 1240 you fix your position 259°T, 3.6 nm from Tern Island tower. You steer 335°T at 4.2 kn until 1300, then 171°T at 7.4 kn until 1340.

   Give the 1340 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 0925 you fix your position 253°T, 3.2 nm from Tern Island tower. You steer 346°T at 6.6 kn until 0950, then 275°T at 7.3 kn until 1010.

   Give the 1010 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  

8. At 1130 you fix your position 287°T, 1.2 nm from Gannet Rock daybeacon. You steer 140°T at 4.4 kn until 1210, then 280°T at 6.3 kn until 1250.

   Give the 1250 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