Worksheet 627 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 338°T, 1.1 nm from Heron Point Light. You steer 045°T at 5.8 kn until 1510, then 108°T at 8.8 kn until 1540.

   Give the 1540 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  

2. At 1510 you fix your position 145°T, 1.3 nm from Tern Island tower. You steer 122°T at 7.3 kn until 1535, then 056°T at 6.3 kn until 1555.

   Give the 1555 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 1155 you fix your position 054°T, 3.3 nm from Westfield church spire. You steer 245°T at 6.2 kn until 1210, then 121°T at 4.2 kn until 1255.

   Give the 1255 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 0915 you fix your position 035°T, 3.3 nm from Gannet Rock daybeacon. You steer 310°T at 7.9 kn until 0925, then 144°T at 9.3 kn until 0940.

   Give the 0940 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 0955 you fix your position 047°T, 1.0 nm from Gannet Rock daybeacon. You steer 117°T at 7.1 kn until 1010, then 175°T at 4.9 kn until 1035.

   Give the 1035 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  

6. At 1600 you fix your position 111°T, 1.6 nm from Tern Island tower. You steer 105°T at 5.5 kn until 1640, then 209°T at 6.6 kn until 1705.

   Give the 1705 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  

7. At 1525 you fix your position 023°T, 3.0 nm from Heron Point Light. You steer 095°T at 9.4 kn until 1545, then 127°T at 9.0 kn until 1610.

   Give the 1610 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 1340 you fix your position 042°T, 3.2 nm from Gannet Rock daybeacon. You steer 180°T at 4.3 kn until 1425, then 255°T at 6.7 kn until 1455.

   Give the 1455 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