Worksheet 602 · Skill 3

Dead reckoning

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1. At 0820 you fix your position 049°T, 3.7 nm from Westfield church spire. You steer 186°T at 4.4 kn until 0840, then 227°T at 9.0 kn until 0850.

   Give the 0850 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 1050 you fix your position 125°T, 1.6 nm from Tern Island tower. You steer 220°T at 6.6 kn until 1130, then 037°T at 8.8 kn until 1145.

   Give the 1145 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 1455 you fix your position 047°T, 3.8 nm from Westfield church spire. You steer 298°T at 6.3 kn until 1515, then 139°T at 8.5 kn until 1525.

   Give the 1525 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 0910 you fix your position 302°T, 0.9 nm from Gannet Rock daybeacon. You steer 075°T at 5.5 kn until 0925, then 186°T at 9.2 kn until 0945.

   Give the 0945 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  

5. At 1220 you fix your position 126°T, 1.5 nm from Gannet Rock daybeacon. You steer 336°T at 5.1 kn until 1250, then 145°T at 9.7 kn until 1300.

   Give the 1300 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 1350 you fix your position 214°T, 2.8 nm from Tern Island tower. You steer 291°T at 9.8 kn until 1400, then 129°T at 5.3 kn until 1410.

   Give the 1410 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 1530 you fix your position 218°T, 1.4 nm from Tern Island tower. You steer 271°T at 8.5 kn until 1545, then 308°T at 8.1 kn until 1555.

   Give the 1555 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 1500 you fix your position 205°T, 3.1 nm from Tern Island tower. You steer 069°T at 9.5 kn until 1535, then 330°T at 9.1 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