Worksheet 593 · Skill 3

Dead reckoning

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1. At 1050 you fix your position 064°T, 2.3 nm from Heron Point Light. You steer 263°T at 9.4 kn until 1100, then 117°T at 7.1 kn until 1120.

   Give the 1120 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 1355 you fix your position 265°T, 3.0 nm from Gannet Rock daybeacon. You steer 000°T at 9.2 kn until 1405, then 103°T at 6.5 kn until 1425.

   Give the 1425 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 0850 you fix your position 031°T, 3.6 nm from Heron Point Light. You steer 216°T at 5.7 kn until 0900, then 119°T at 4.2 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 1450 you fix your position 247°T, 2.2 nm from Gannet Rock daybeacon. You steer 244°T at 5.1 kn until 1500, then 319°T at 5.4 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  

5. At 1155 you fix your position 039°T, 3.3 nm from Westfield church spire. You steer 177°T at 9.1 kn until 1210, then 026°T at 7.1 kn until 1240.

   Give the 1240 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 1045 you fix your position 069°T, 1.3 nm from Heron Point Light. You steer 103°T at 9.0 kn until 1105, then 282°T at 4.1 kn until 1115.

   Give the 1115 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 1005 you fix your position 316°T, 2.1 nm from Tern Island tower. You steer 099°T at 7.6 kn until 1045, then 279°T at 8.0 kn until 1120.

   Give the 1120 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 1135 you fix your position 305°T, 2.5 nm from Tern Island tower. You steer 193°T at 5.8 kn until 1155, then 067°T at 5.9 kn until 1205.

   Give the 1205 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