Worksheet 758 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 354°T, 1.6 nm from Heron Point Light. You steer 064°T at 7.3 kn until 1250, then 174°T at 10.0 kn until 1300.

   Give the 1300 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  

2. At 0705 you fix your position 359°T, 1.8 nm from Gannet Rock daybeacon. You steer 085°T at 4.8 kn until 0740, then 169°T at 5.4 kn until 0800.

   Give the 0800 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 0850 you fix your position 305°T, 1.9 nm from Kittle water tank. You steer 321°T at 6.4 kn until 0935, then 211°T at 7.7 kn until 0945.

   Give the 0945 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 0935 you fix your position 245°T, 1.8 nm from Tern Island tower. You steer 273°T at 6.3 kn until 1020, then 131°T at 7.0 kn until 1035.

   Give the 1035 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 1305 you fix your position 075°T, 4.2 nm from Tern Island tower. You steer 091°T at 5.4 kn until 1315, then 275°T at 6.0 kn until 1325.

   Give the 1325 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  

6. At 1200 you fix your position 043°T, 1.6 nm from Gannet Rock daybeacon. You steer 244°T at 6.3 kn until 1210, then 352°T at 5.3 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  

7. At 1300 you fix your position 079°T, 2.0 nm from Heron Point Light. You steer 025°T at 9.3 kn until 1325, then 266°T at 4.4 kn until 1355.

   Give the 1355 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 1540 you fix your position 024°T, 1.5 nm from Tern Island tower. You steer 121°T at 8.3 kn until 1600, then 298°T at 6.6 kn until 1635.

   Give the 1635 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