Worksheet 15 · Skill 3

Dead reckoning

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1. At 1215 you fix your position 264°T, 3.1 nm from Tern Island tower. You steer 257°T at 7.1 kn until 1235, then 093°T at 9.4 kn until 1245.

   Give the 1245 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  

2. At 1200 you fix your position 083°T, 0.9 nm from Gannet Rock daybeacon. You steer 114°T at 4.3 kn until 1215, then 307°T at 4.2 kn until 1245.

   Give the 1245 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 0955 you fix your position 230°T, 3.3 nm from Tern Island tower. You steer 322°T at 8.6 kn until 1025, then 166°T at 5.0 kn until 1045.

   Give the 1045 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 1350 you fix your position 031°T, 3.7 nm from Heron Point Light. You steer 301°T at 5.4 kn until 1425, then 196°T at 4.4 kn until 1435.

   Give the 1435 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 1325 you fix your position 227°T, 2.1 nm from Gannet Rock daybeacon. You steer 258°T at 5.9 kn until 1340, then 082°T at 5.9 kn until 1415.

   Give the 1415 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 1450 you fix your position 135°T, 0.9 nm from Gannet Rock daybeacon. You steer 257°T at 4.0 kn until 1535, then 046°T at 5.0 kn until 1600.

   Give the 1600 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 1410 you fix your position 050°T, 3.0 nm from Heron Point Light. You steer 134°T at 8.7 kn until 1420, then 316°T at 5.5 kn until 1440.

   Give the 1440 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  

8. At 1240 you fix your position 116°T, 2.1 nm from Gannet Rock daybeacon. You steer 343°T at 4.3 kn until 1300, then 041°T at 8.3 kn until 1315.

   Give the 1315 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