Worksheet 567 · Skill 3

Dead reckoning

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1. At 1345 you fix your position 242°T, 2.4 nm from Gannet Rock daybeacon. You steer 041°T at 9.9 kn until 1410, then 247°T at 6.5 kn until 1420.

   Give the 1420 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  

2. At 1225 you fix your position 029°T, 1.5 nm from Heron Point Light. You steer 032°T at 5.0 kn until 1305, then 150°T at 5.2 kn until 1340.

   Give the 1340 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 1110 you fix your position 069°T, 2.2 nm from Heron Point Light. You steer 126°T at 5.8 kn until 1130, then 096°T at 4.4 kn until 1210.

   Give the 1210 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  

4. At 0710 you fix your position 022°T, 2.8 nm from Heron Point Light. You steer 144°T at 4.4 kn until 0745, then 007°T at 5.1 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  

5. At 0910 you fix your position 051°T, 2.1 nm from Westfield church spire. You steer 071°T at 8.2 kn until 0920, then 138°T at 8.8 kn until 0940.

   Give the 0940 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 0740 you fix your position 123°T, 2.1 nm from Westfield church spire. You steer 003°T at 5.5 kn until 0815, then 142°T at 4.0 kn until 0855.

   Give the 0855 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 0800 you fix your position 021°T, 1.8 nm from Gannet Rock daybeacon. You steer 250°T at 7.7 kn until 0830, then 172°T at 8.3 kn until 0845.

   Give the 0845 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  

8. At 1215 you fix your position 002°T, 2.6 nm from Mill stack. You steer 058°T at 6.9 kn until 1300, then 298°T at 5.0 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