Worksheet 422 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 042°T, 4.1 nm from Westfield church spire. You steer 082°T at 8.9 kn until 1410, then 233°T at 4.7 kn until 1445.

   Give the 1445 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 1000 you fix your position 061°T, 2.8 nm from Westfield church spire. You steer 077°T at 4.1 kn until 1020, then 265°T at 7.8 kn until 1040.

   Give the 1040 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 0715 you fix your position 142°T, 3.3 nm from Westfield church spire. You steer 088°T at 7.8 kn until 0735, then 358°T at 5.7 kn until 0750.

   Give the 0750 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 1130 you fix your position 076°T, 3.5 nm from Westfield church spire. You steer 270°T at 9.6 kn until 1150, then 093°T at 8.7 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  

5. At 1345 you fix your position 096°T, 1.7 nm from Heron Point Light. You steer 086°T at 6.6 kn until 1355, then 324°T at 9.3 kn until 1430.

   Give the 1430 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 1430 you fix your position 229°T, 2.9 nm from Tern Island tower. You steer 142°T at 4.7 kn until 1445, then 075°T at 9.4 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  

7. At 1055 you fix your position 014°T, 1.7 nm from Heron Point Light. You steer 341°T at 7.7 kn until 1135, then 157°T at 5.6 kn until 1145.

   Give the 1145 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 1435 you fix your position 278°T, 2.1 nm from Tern Island tower. You steer 000°T at 7.2 kn until 1445, then 273°T at 8.0 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