Worksheet 509 · Skill 3

Dead reckoning

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1. At 1020 you fix your position 078°T, 2.9 nm from Tern Island tower. You steer 227°T at 8.0 kn until 1030, then 331°T at 9.3 kn until 1050.

   Give the 1050 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 0920 you fix your position 055°T, 3.0 nm from Gannet Rock daybeacon. You steer 165°T at 4.3 kn until 0935, then 238°T at 9.8 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  

3. At 0720 you fix your position 070°T, 2.9 nm from Westfield church spire. You steer 233°T at 8.4 kn until 0735, then 033°T at 8.8 kn until 0755.

   Give the 0755 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 1455 you fix your position 319°T, 2.8 nm from Tern Island tower. You steer 266°T at 7.4 kn until 1510, then 132°T at 5.4 kn until 1535.

   Give the 1535 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 1005 you fix your position 037°T, 4.1 nm from Gannet Rock daybeacon. You steer 214°T at 6.0 kn until 1020, then 312°T at 5.1 kn until 1105.

   Give the 1105 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 0930 you fix your position 322°T, 1.1 nm from Gannet Rock daybeacon. You steer 258°T at 6.0 kn until 0955, then 078°T at 9.2 kn until 1030.

   Give the 1030 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 1220 you fix your position 044°T, 2.9 nm from Tern Island tower. You steer 141°T at 6.7 kn until 1245, then 202°T at 6.6 kn until 1305.

   Give the 1305 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  

8. At 1105 you fix your position 034°T, 4.0 nm from Gannet Rock daybeacon. You steer 169°T at 7.0 kn until 1140, then 274°T at 4.4 kn until 1220.

   Give the 1220 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