Worksheet 136 · Skill 3

Dead reckoning

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1. At 1215 you fix your position 061°T, 4.6 nm from Tern Island tower. You steer 176°T at 7.9 kn until 1255, then 322°T at 4.6 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  

2. At 1005 you fix your position 247°T, 3.3 nm from Tern Island tower. You steer 147°T at 9.2 kn until 1030, then 077°T at 9.1 kn until 1045.

   Give the 1045 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 0830 you fix your position 303°T, 2.1 nm from Tern Island tower. You steer 228°T at 4.3 kn until 0910, then 034°T at 9.1 kn until 0925.

   Give the 0925 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 1505 you fix your position 265°T, 3.1 nm from Tern Island tower. You steer 247°T at 9.8 kn until 1525, then 118°T at 4.9 kn until 1540.

   Give the 1540 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  

5. At 1155 you fix your position 048°T, 3.4 nm from Gannet Rock daybeacon. You steer 211°T at 4.5 kn until 1225, then 005°T at 4.0 kn until 1255.

   Give the 1255 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  

6. At 1055 you fix your position 023°T, 2.5 nm from Kittle water tank. You steer 349°T at 6.0 kn until 1120, then 166°T at 4.7 kn until 1155.

   Give the 1155 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  

7. At 1205 you fix your position 018°T, 1.9 nm from Heron Point Light. You steer 015°T at 7.8 kn until 1225, then 322°T at 4.5 kn until 1250.

   Give the 1250 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 1150 you fix your position 254°T, 3.3 nm from Tern Island tower. You steer 324°T at 6.1 kn until 1200, then 166°T at 4.7 kn until 1210.

   Give the 1210 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