Worksheet 486 · Skill 3

Dead reckoning

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1. At 0910 you fix your position 022°T, 1.5 nm from Gannet Rock daybeacon. You steer 250°T at 7.8 kn until 0955, then 201°T at 5.1 kn until 1015.

   Give the 1015 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 1400 you fix your position 018°T, 2.2 nm from Tern Island tower. You steer 098°T at 7.5 kn until 1430, then 159°T at 6.2 kn until 1440.

   Give the 1440 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 0715 you fix your position 147°T, 1.9 nm from Westfield church spire. You steer 079°T at 4.9 kn until 0755, then 307°T at 5.8 kn until 0815.

   Give the 0815 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 1015 you fix your position 079°T, 3.0 nm from Gannet Rock daybeacon. You steer 301°T at 8.5 kn until 1035, then 237°T at 8.6 kn until 1100.

   Give the 1100 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  

5. At 0835 you fix your position 018°T, 2.1 nm from Heron Point Light. You steer 053°T at 5.2 kn until 0915, then 330°T at 6.8 kn until 0930.

   Give the 0930 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 1010 you fix your position 298°T, 1.8 nm from Kittle water tank. You steer 074°T at 4.2 kn until 1020, then 274°T at 6.4 kn until 1055.

   Give the 1055 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  

7. At 1150 you fix your position 079°T, 2.3 nm from Tern Island tower. You steer 162°T at 8.3 kn until 1220, then 252°T at 8.4 kn until 1300.

   Give the 1300 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  

8. At 1150 you fix your position 031°T, 1.8 nm from Tern Island tower. You steer 256°T at 9.3 kn until 1215, then 072°T at 9.7 kn until 1240.

   Give the 1240 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