Worksheet 672 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 099°T, 3.1 nm from Westfield church spire. You steer 202°T at 4.3 kn until 0745, then 039°T at 8.9 kn until 0805.

   Give the 0805 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 1535 you fix your position 230°T, 0.9 nm from Gannet Rock daybeacon. You steer 267°T at 7.1 kn until 1610, then 304°T at 4.0 kn until 1650.

   Give the 1650 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  

3. At 1015 you fix your position 060°T, 1.7 nm from Heron Point Light. You steer 059°T at 4.7 kn until 1040, then 095°T at 8.8 kn until 1055.

   Give the 1055 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  

4. At 1445 you fix your position 020°T, 1.2 nm from Westfield church spire. You steer 059°T at 4.6 kn until 1510, then 262°T at 5.7 kn until 1525.

   Give the 1525 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 1315 you fix your position 080°T, 1.0 nm from Gannet Rock daybeacon. You steer 214°T at 4.3 kn until 1350, then 049°T at 4.7 kn until 1430.

   Give the 1430 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 0755 you fix your position 218°T, 2.7 nm from Tern Island tower. You steer 002°T at 4.7 kn until 0840, then 178°T at 9.6 kn until 0910.

   Give the 0910 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 1415 you fix your position 310°T, 1.3 nm from Kittle water tank. You steer 338°T at 4.3 kn until 1440, then 276°T at 5.8 kn until 1510.

   Give the 1510 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 1535 you fix your position 011°T, 2.4 nm from Mill stack. You steer 132°T at 5.3 kn until 1555, then 273°T at 6.6 kn until 1630.

   Give the 1630 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