Worksheet 616 · Skill 3

Dead reckoning

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1. At 1245 you fix your position 007°T, 2.7 nm from Westfield church spire. You steer 129°T at 7.5 kn until 1325, then 238°T at 4.5 kn until 1400.

   Give the 1400 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 1410 you fix your position 065°T, 3.3 nm from Westfield church spire. You steer 007°T at 5.3 kn until 1425, then 162°T at 9.2 kn until 1510.

   Give the 1510 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  

3. At 0830 you fix your position 268°T, 2.9 nm from Tern Island tower. You steer 122°T at 6.7 kn until 0910, then 235°T at 9.9 kn until 0930.

   Give the 0930 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  

4. At 1555 you fix your position 085°T, 1.3 nm from Gannet Rock daybeacon. You steer 196°T at 5.9 kn until 1620, then 301°T at 9.7 kn until 1700.

   Give the 1700 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 1440 you fix your position 079°T, 2.0 nm from Heron Point Light. You steer 004°T at 4.3 kn until 1520, then 077°T at 4.0 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  

6. At 1245 you fix your position 076°T, 3.3 nm from Tern Island tower. You steer 188°T at 6.8 kn until 1325, then 286°T at 9.1 kn until 1350.

   Give the 1350 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 1325 you fix your position 217°T, 2.7 nm from Tern Island tower. You steer 334°T at 10.0 kn until 1340, then 126°T at 4.1 kn until 1405.

   Give the 1405 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 0820 you fix your position 327°T, 3.0 nm from Kittle water tank. You steer 131°T at 6.0 kn until 0835, then 045°T at 6.1 kn until 0845.

   Give the 0845 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