Worksheet 676 · Skill 3

Dead reckoning

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1. At 1000 you fix your position 044°T, 3.4 nm from Westfield church spire. You steer 213°T at 8.7 kn until 1010, then 127°T at 4.7 kn until 1020.

   Give the 1020 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 1100 you fix your position 094°T, 2.7 nm from Westfield church spire. You steer 313°T at 8.6 kn until 1110, then 110°T at 4.6 kn until 1140.

   Give the 1140 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 1525 you fix your position 054°T, 3.0 nm from Tern Island tower. You steer 154°T at 7.6 kn until 1555, then 253°T at 4.6 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  

4. At 1020 you fix your position 159°T, 1.4 nm from Tern Island tower. You steer 170°T at 6.6 kn until 1055, then 066°T at 4.1 kn until 1120.

   Give the 1120 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 1440 you fix your position 349°T, 2.2 nm from Mill stack. You steer 288°T at 6.7 kn until 1450, then 220°T at 4.8 kn until 1505.

   Give the 1505 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 1320 you fix your position 051°T, 3.2 nm from Tern Island tower. You steer 081°T at 4.0 kn until 1350, then 254°T at 10.0 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 0740 you fix your position 009°T, 3.5 nm from Westfield church spire. You steer 088°T at 6.8 kn until 0825, then 174°T at 5.8 kn until 0910.

   Give the 0910 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 0910 you fix your position 031°T, 3.9 nm from Gannet Rock daybeacon. You steer 304°T at 5.8 kn until 0935, then 231°T at 4.2 kn until 0945.

   Give the 0945 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