Worksheet 685 · Skill 3

Dead reckoning

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1. At 1125 you fix your position 284°T, 3.0 nm from Tern Island tower. You steer 225°T at 9.4 kn until 1145, then 338°T at 7.7 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  

2. At 1555 you fix your position 188°T, 1.1 nm from Gannet Rock daybeacon. You steer 304°T at 9.2 kn until 1620, then 078°T at 7.8 kn until 1640.

   Give the 1640 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 1100 you fix your position 241°T, 3.3 nm from Tern Island tower. You steer 127°T at 4.7 kn until 1110, then 087°T at 4.5 kn until 1155.

   Give the 1155 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  

4. At 0830 you fix your position 311°T, 2.1 nm from Tern Island tower. You steer 294°T at 4.5 kn until 0850, then 213°T at 9.8 kn until 0910.

   Give the 0910 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  

5. At 1400 you fix your position 256°T, 2.8 nm from Gannet Rock daybeacon. You steer 037°T at 8.4 kn until 1410, then 184°T at 7.6 kn until 1425.

   Give the 1425 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  

6. At 1210 you fix your position 097°T, 1.0 nm from Westfield church spire. You steer 112°T at 7.8 kn until 1245, then 326°T at 9.9 kn until 1325.

   Give the 1325 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 1420 you fix your position 070°T, 3.6 nm from Westfield church spire. You steer 158°T at 5.4 kn until 1500, then 349°T at 5.6 kn until 1545.

   Give the 1545 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 1150 you fix your position 011°T, 2.4 nm from Heron Point Light. You steer 060°T at 7.0 kn until 1220, then 226°T at 9.2 kn until 1235.

   Give the 1235 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