Worksheet 539 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 054°T, 2.1 nm from Tern Island tower. You steer 086°T at 7.5 kn until 1100, then 241°T at 6.0 kn until 1130.

   Give the 1130 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 1200 you fix your position 047°T, 1.7 nm from Heron Point Light. You steer 105°T at 9.8 kn until 1225, then 264°T at 4.5 kn until 1250.

   Give the 1250 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 0915 you fix your position 073°T, 3.4 nm from Westfield church spire. You steer 036°T at 5.4 kn until 0935, then 262°T at 10.0 kn until 0955.

   Give the 0955 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  

4. At 1255 you fix your position 136°T, 1.6 nm from Gannet Rock daybeacon. You steer 035°T at 6.7 kn until 1320, then 207°T at 9.6 kn until 1335.

   Give the 1335 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  

5. At 0825 you fix your position 054°T, 3.1 nm from Westfield church spire. You steer 172°T at 7.7 kn until 0900, then 041°T at 8.4 kn until 0910.

   Give the 0910 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 1255 you fix your position 221°T, 1.7 nm from Tern Island tower. You steer 109°T at 8.3 kn until 1305, then 296°T at 8.0 kn until 1340.

   Give the 1340 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 1135 you fix your position 251°T, 1.2 nm from Gannet Rock daybeacon. You steer 313°T at 6.7 kn until 1215, then 017°T at 7.5 kn until 1235.

   Give the 1235 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 1305 you fix your position 326°T, 2.3 nm from Tern Island tower. You steer 275°T at 4.6 kn until 1315, then 199°T at 8.6 kn until 1350.

   Give the 1350 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