Worksheet 419 · Skill 3

Dead reckoning

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1. At 0955 you fix your position 210°T, 2.9 nm from Tern Island tower. You steer 177°T at 7.0 kn until 1010, then 314°T at 8.6 kn until 1025.

   Give the 1025 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 1520 you fix your position 317°T, 3.1 nm from Tern Island tower. You steer 234°T at 9.5 kn until 1535, then 121°T at 6.0 kn until 1620.

   Give the 1620 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  

3. At 1355 you fix your position 341°T, 1.2 nm from Tern Island tower. You steer 091°T at 7.2 kn until 1410, then 332°T at 6.2 kn until 1425.

   Give the 1425 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 0700 you fix your position 020°T, 0.8 nm from Gannet Rock daybeacon. You steer 258°T at 5.5 kn until 0730, then 058°T at 7.6 kn until 0800.

   Give the 0800 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 0915 you fix your position 030°T, 3.0 nm from Heron Point Light. You steer 160°T at 6.1 kn until 0940, then 081°T at 5.5 kn until 1010.

   Give the 1010 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  

6. At 0815 you fix your position 046°T, 2.1 nm from Westfield church spire. You steer 160°T at 7.2 kn until 0840, then 100°T at 7.1 kn until 0910.

   Give the 0910 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 1035 you fix your position 245°T, 2.1 nm from Gannet Rock daybeacon. You steer 242°T at 9.0 kn until 1045, then 074°T at 6.2 kn until 1115.

   Give the 1115 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  

8. At 1225 you fix your position 005°T, 2.0 nm from Tern Island tower. You steer 245°T at 6.1 kn until 1310, then 277°T at 9.0 kn until 1325.

   Give the 1325 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