Worksheet 800 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 314°T, 1.0 nm from Gannet Rock daybeacon. You steer 282°T at 5.1 kn until 1050, then 177°T at 4.8 kn until 1110.

   Give the 1110 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  

2. At 0815 you fix your position 236°T, 3.0 nm from Tern Island tower. You steer 210°T at 4.1 kn until 0825, then 282°T at 4.1 kn until 0845.

   Give the 0845 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  

3. At 1505 you fix your position 252°T, 1.3 nm from Gannet Rock daybeacon. You steer 134°T at 6.9 kn until 1520, then 263°T at 8.4 kn until 1530.

   Give the 1530 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  

4. At 0840 you fix your position 270°T, 2.6 nm from Tern Island tower. You steer 162°T at 5.4 kn until 0920, then 044°T at 5.5 kn until 0955.

   Give the 0955 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 1400 you fix your position 311°T, 1.6 nm from Kittle water tank. You steer 055°T at 4.8 kn until 1415, then 016°T at 9.7 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  

6. At 1450 you fix your position 295°T, 4.1 nm from Tern Island tower. You steer 185°T at 4.4 kn until 1525, then 054°T at 9.5 kn until 1545.

   Give the 1545 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 1200 you fix your position 018°T, 1.3 nm from Gannet Rock daybeacon. You steer 139°T at 7.7 kn until 1215, then 259°T at 8.5 kn until 1245.

   Give the 1245 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 1445 you fix your position 058°T, 1.8 nm from Heron Point Light. You steer 029°T at 7.0 kn until 1515, then 137°T at 4.2 kn until 1550.

   Give the 1550 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