Worksheet 157 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 153°T, 1.2 nm from Gannet Rock daybeacon. You steer 025°T at 6.5 kn until 1240, then 164°T at 4.1 kn until 1310.

   Give the 1310 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 0935 you fix your position 310°T, 1.7 nm from Kittle water tank. You steer 288°T at 6.0 kn until 1000, then 114°T at 4.6 kn until 1010.

   Give the 1010 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 1425 you fix your position 033°T, 1.9 nm from Heron Point Light. You steer 331°T at 9.7 kn until 1440, then 106°T at 8.8 kn until 1500.

   Give the 1500 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 0925 you fix your position 084°T, 3.3 nm from Westfield church spire. You steer 144°T at 4.1 kn until 0950, then 058°T at 4.4 kn until 1010.

   Give the 1010 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 0710 you fix your position 043°T, 2.9 nm from Westfield church spire. You steer 284°T at 7.4 kn until 0720, then 079°T at 9.7 kn until 0745.

   Give the 0745 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 1400 you fix your position 141°T, 1.2 nm from Gannet Rock daybeacon. You steer 267°T at 9.8 kn until 1440, then 021°T at 5.1 kn until 1525.

   Give the 1525 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 0730 you fix your position 092°T, 2.3 nm from Westfield church spire. You steer 147°T at 5.8 kn until 0800, then 260°T at 9.6 kn until 0810.

   Give the 0810 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 0810 you fix your position 288°T, 2.9 nm from Tern Island tower. You steer 022°T at 4.7 kn until 0825, then 187°T at 6.0 kn until 0835.

   Give the 0835 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