Worksheet 481 · Skill 3

Dead reckoning

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1. At 1325 you fix your position 024°T, 2.1 nm from Heron Point Light. You steer 327°T at 9.9 kn until 1345, then 077°T at 8.9 kn until 1430.

   Give the 1430 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 1045 you fix your position 027°T, 2.4 nm from Heron Point Light. You steer 354°T at 6.2 kn until 1105, then 067°T at 4.2 kn until 1130.

   Give the 1130 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 1350 you fix your position 059°T, 2.1 nm from Tern Island tower. You steer 073°T at 8.4 kn until 1400, then 177°T at 4.1 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  

4. At 1545 you fix your position 346°T, 2.6 nm from Tern Island tower. You steer 214°T at 10.0 kn until 1610, then 255°T at 7.5 kn until 1630.

   Give the 1630 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 0720 you fix your position 238°T, 3.4 nm from Tern Island tower. You steer 157°T at 5.7 kn until 0745, then 060°T at 6.1 kn until 0805.

   Give the 0805 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 1505 you fix your position 357°T, 2.9 nm from Mill stack. You steer 057°T at 4.0 kn until 1520, then 329°T at 5.3 kn until 1540.

   Give the 1540 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 0850 you fix your position 019°T, 2.6 nm from Gannet Rock daybeacon. You steer 205°T at 7.9 kn until 0905, then 354°T at 4.7 kn until 0940.

   Give the 0940 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 1150 you fix your position 044°T, 2.4 nm from Gannet Rock daybeacon. You steer 249°T at 4.2 kn until 1200, then 191°T at 4.1 kn until 1225.

   Give the 1225 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