Worksheet 726 · Skill 3

Dead reckoning

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1. At 1320 you fix your position 052°T, 3.4 nm from Westfield church spire. You steer 309°T at 7.1 kn until 1330, then 089°T at 5.1 kn until 1400.

   Give the 1400 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 0700 you fix your position 019°T, 1.5 nm from Tern Island tower. You steer 086°T at 5.0 kn until 0715, then 168°T at 6.2 kn until 0730.

   Give the 0730 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 1120 you fix your position 007°T, 1.5 nm from Mill stack. You steer 051°T at 7.3 kn until 1145, then 175°T at 4.0 kn until 1215.

   Give the 1215 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 0745 you fix your position 261°T, 2.0 nm from Gannet Rock daybeacon. You steer 143°T at 7.1 kn until 0805, then 091°T at 6.6 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  

5. At 0905 you fix your position 021°T, 2.5 nm from Gannet Rock daybeacon. You steer 159°T at 7.2 kn until 0915, then 246°T at 7.7 kn until 0950.

   Give the 0950 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 0735 you fix your position 056°T, 3.1 nm from Heron Point Light. You steer 074°T at 4.3 kn until 0750, then 261°T at 7.5 kn until 0820.

   Give the 0820 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  

7. At 0945 you fix your position 018°T, 2.3 nm from Heron Point Light. You steer 244°T at 4.7 kn until 1005, then 086°T at 10.0 kn until 1030.

   Give the 1030 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  

8. At 0900 you fix your position 035°T, 1.1 nm from Westfield church spire. You steer 084°T at 5.7 kn until 0925, then 348°T at 8.0 kn until 0940.

   Give the 0940 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