Worksheet 36 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 304°T, 4.2 nm from Tern Island tower. You steer 104°T at 4.1 kn until 1300, then 206°T at 8.2 kn until 1320.

   Give the 1320 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 1435 you fix your position 286°T, 2.5 nm from Tern Island tower. You steer 312°T at 8.1 kn until 1445, then 233°T at 4.9 kn until 1505.

   Give the 1505 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  

3. At 1410 you fix your position 039°T, 3.1 nm from Gannet Rock daybeacon. You steer 012°T at 5.6 kn until 1435, then 235°T at 5.8 kn until 1510.

   Give the 1510 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 1120 you fix your position 067°T, 2.5 nm from Westfield church spire. You steer 033°T at 8.4 kn until 1130, then 175°T at 6.5 kn until 1200.

   Give the 1200 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  

5. At 0910 you fix your position 057°T, 3.0 nm from Heron Point Light. You steer 143°T at 5.0 kn until 0935, then 270°T at 6.9 kn until 0955.

   Give the 0955 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  

6. At 1525 you fix your position 228°T, 3.1 nm from Tern Island tower. You steer 158°T at 7.6 kn until 1545, then 350°T at 7.7 kn until 1620.

   Give the 1620 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 0950 you fix your position 094°T, 1.6 nm from Westfield church spire. You steer 012°T at 6.5 kn until 1000, then 302°T at 9.9 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 1340 you fix your position 026°T, 1.3 nm from Kittle water tank. You steer 077°T at 5.4 kn until 1350, then 268°T at 4.6 kn until 1435.

   Give the 1435 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