Worksheet 710 · Skill 3

Dead reckoning

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1. At 1555 you fix your position 061°T, 1.5 nm from Gannet Rock daybeacon. You steer 212°T at 4.6 kn until 1625, then 102°T at 9.1 kn until 1635.

   Give the 1635 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  

2. At 0725 you fix your position 107°T, 1.3 nm from Westfield church spire. You steer 159°T at 7.8 kn until 0740, then 044°T at 8.2 kn until 0820.

   Give the 0820 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 1430 you fix your position 244°T, 1.7 nm from Gannet Rock daybeacon. You steer 187°T at 7.0 kn until 1445, then 345°T at 4.8 kn until 1530.

   Give the 1530 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 0825 you fix your position 081°T, 3.5 nm from Westfield church spire. You steer 340°T at 4.4 kn until 0910, then 246°T at 8.3 kn until 0920.

   Give the 0920 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 0745 you fix your position 033°T, 4.1 nm from Westfield church spire. You steer 158°T at 6.7 kn until 0755, then 120°T at 6.2 kn until 0810.

   Give the 0810 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  

6. At 1035 you fix your position 065°T, 1.4 nm from Heron Point Light. You steer 106°T at 5.1 kn until 1105, then 298°T at 9.3 kn until 1135.

   Give the 1135 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 1305 you fix your position 019°T, 2.4 nm from Tern Island tower. You steer 273°T at 8.1 kn until 1350, then 167°T at 9.2 kn until 1415.

   Give the 1415 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 1600 you fix your position 076°T, 1.5 nm from Gannet Rock daybeacon. You steer 029°T at 5.9 kn until 1610, then 206°T at 9.4 kn until 1630.

   Give the 1630 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