Worksheet 669 · Skill 3

Dead reckoning

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1. At 0900 you fix your position 200°T, 0.9 nm from Gannet Rock daybeacon. You steer 273°T at 4.6 kn until 0920, then 114°T at 5.4 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  

2. At 1350 you fix your position 058°T, 2.6 nm from Westfield church spire. You steer 269°T at 5.6 kn until 1410, then 012°T at 5.0 kn until 1420.

   Give the 1420 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  

3. At 0855 you fix your position 047°T, 1.2 nm from Gannet Rock daybeacon. You steer 251°T at 9.0 kn until 0920, then 322°T at 9.1 kn until 1000.

   Give the 1000 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 1305 you fix your position 075°T, 1.9 nm from Gannet Rock daybeacon. You steer 005°T at 5.2 kn until 1325, then 203°T at 9.4 kn until 1340.

   Give the 1340 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 1010 you fix your position 047°T, 3.6 nm from Gannet Rock daybeacon. You steer 311°T at 6.8 kn until 1030, then 045°T at 4.4 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  

6. At 1355 you fix your position 346°T, 1.6 nm from Kittle water tank. You steer 280°T at 5.3 kn until 1425, then 330°T at 5.6 kn until 1435.

   Give the 1435 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 1405 you fix your position 328°T, 1.8 nm from Mill stack. You steer 004°T at 4.3 kn until 1445, then 227°T at 4.4 kn until 1525.

   Give the 1525 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  

8. At 0955 you fix your position 074°T, 3.0 nm from Tern Island tower. You steer 027°T at 4.2 kn until 1005, then 069°T at 4.7 kn until 1025.

   Give the 1025 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