Worksheet 717 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 014°T, 1.5 nm from Heron Point Light. You steer 028°T at 8.5 kn until 1605, then 195°T at 8.2 kn until 1625.

   Give the 1625 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 0840 you fix your position 248°T, 2.4 nm from Gannet Rock daybeacon. You steer 314°T at 4.7 kn until 0925, then 124°T at 10.0 kn until 0935.

   Give the 0935 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  

3. At 1045 you fix your position 093°T, 2.9 nm from Westfield church spire. You steer 035°T at 6.8 kn until 1120, then 240°T at 8.3 kn until 1140.

   Give the 1140 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 1215 you fix your position 258°T, 2.3 nm from Gannet Rock daybeacon. You steer 334°T at 6.1 kn until 1235, then 301°T at 6.8 kn until 1250.

   Give the 1250 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 1230 you fix your position 343°T, 0.9 nm from Heron Point Light. You steer 019°T at 8.1 kn until 1305, then 231°T at 5.3 kn until 1315.

   Give the 1315 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  

6. At 1310 you fix your position 016°T, 2.2 nm from Westfield church spire. You steer 113°T at 9.3 kn until 1345, then 299°T at 6.9 kn until 1405.

   Give the 1405 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 1435 you fix your position 057°T, 1.8 nm from Westfield church spire. You steer 175°T at 9.5 kn until 1450, then 277°T at 4.2 kn until 1510.

   Give the 1510 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 1325 you fix your position 045°T, 1.8 nm from Kittle water tank. You steer 353°T at 9.5 kn until 1350, then 154°T at 7.5 kn until 1410.

   Give the 1410 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