Worksheet 79 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 041°T, 1.7 nm from Westfield church spire. You steer 346°T at 8.9 kn until 1350, then 110°T at 8.7 kn until 1425.

   Give the 1425 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  

2. At 0720 you fix your position 013°T, 1.7 nm from Mill stack. You steer 050°T at 6.4 kn until 0745, then 251°T at 6.8 kn until 0815.

   Give the 0815 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

3. At 1250 you fix your position 286°T, 3.0 nm from Tern Island tower. You steer 148°T at 8.4 kn until 1315, then 245°T at 7.7 kn until 1330.

   Give the 1330 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  

4. At 1515 you fix your position 031°T, 3.5 nm from Westfield church spire. You steer 154°T at 6.5 kn until 1525, then 243°T at 6.8 kn until 1540.

   Give the 1540 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 0715 you fix your position 349°T, 1.6 nm from Gannet Rock daybeacon. You steer 122°T at 6.7 kn until 0750, then 275°T at 4.9 kn until 0820.

   Give the 0820 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  

6. At 1410 you fix your position 043°T, 3.1 nm from Heron Point Light. You steer 350°T at 4.8 kn until 1440, then 189°T at 8.2 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  

7. At 1245 you fix your position 255°T, 2.4 nm from Gannet Rock daybeacon. You steer 075°T at 4.2 kn until 1300, then 331°T at 7.5 kn until 1310.

   Give the 1310 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 0805 you fix your position 039°T, 4.1 nm from Gannet Rock daybeacon. You steer 286°T at 5.4 kn until 0845, then 246°T at 9.1 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