Worksheet 547 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 049°T, 1.5 nm from Gannet Rock daybeacon. You steer 001°T at 4.7 kn until 1415, then 155°T at 8.3 kn until 1450.

   Give the 1450 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 0710 you fix your position 301°T, 3.2 nm from Tern Island tower. You steer 216°T at 5.9 kn until 0745, then 135°T at 4.2 kn until 0800.

   Give the 0800 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  

3. At 0710 you fix your position 258°T, 2.6 nm from Gannet Rock daybeacon. You steer 306°T at 4.5 kn until 0750, then 119°T at 9.3 kn until 0835.

   Give the 0835 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 1430 you fix your position 216°T, 2.5 nm from Tern Island tower. You steer 324°T at 8.2 kn until 1510, then 220°T at 9.4 kn until 1530.

   Give the 1530 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 1535 you fix your position 326°T, 1.8 nm from Heron Point Light. You steer 109°T at 5.1 kn until 1555, then 048°T at 4.9 kn until 1625.

   Give the 1625 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 1310 you fix your position 198°T, 2.6 nm from Tern Island tower. You steer 330°T at 7.7 kn until 1325, then 010°T at 9.3 kn until 1335.

   Give the 1335 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 1255 you fix your position 064°T, 3.0 nm from Westfield church spire. You steer 311°T at 7.5 kn until 1320, then 145°T at 10.0 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  

8. At 1215 you fix your position 279°T, 1.7 nm from Gannet Rock daybeacon. You steer 280°T at 7.8 kn until 1240, then 244°T at 9.3 kn until 1255.

   Give the 1255 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