Worksheet 740 · Skill 3

Dead reckoning

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1. At 1125 you fix your position 052°T, 4.0 nm from Westfield church spire. You steer 230°T at 4.3 kn until 1135, then 138°T at 4.9 kn until 1155.

   Give the 1155 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 1415 you fix your position 288°T, 1.3 nm from Gannet Rock daybeacon. You steer 303°T at 9.8 kn until 1445, then 151°T at 8.3 kn until 1515.

   Give the 1515 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

3. At 1155 you fix your position 011°T, 2.4 nm from Heron Point Light. You steer 000°T at 9.5 kn until 1210, then 040°T at 5.1 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  

4. At 0740 you fix your position 231°T, 2.9 nm from Tern Island tower. You steer 141°T at 4.6 kn until 0800, then 317°T at 7.1 kn until 0820.

   Give the 0820 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 1555 you fix your position 197°T, 2.3 nm from Tern Island tower. You steer 177°T at 5.2 kn until 1605, then 238°T at 9.7 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 0800 you fix your position 105°T, 1.1 nm from Gannet Rock daybeacon. You steer 096°T at 4.5 kn until 0815, then 307°T at 4.3 kn until 0830.

   Give the 0830 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  

7. At 0715 you fix your position 048°T, 1.9 nm from Westfield church spire. You steer 031°T at 8.7 kn until 0730, then 163°T at 9.1 kn until 0755.

   Give the 0755 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 0855 you fix your position 044°T, 2.7 nm from Tern Island tower. You steer 130°T at 4.2 kn until 0910, then 189°T at 5.8 kn until 0930.

   Give the 0930 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