Worksheet 386 · Skill 3

Dead reckoning

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1. At 0750 you fix your position 028°T, 3.5 nm from Heron Point Light. You steer 196°T at 5.1 kn until 0810, then 268°T at 7.7 kn until 0825.

   Give the 0825 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 1120 you fix your position 190°T, 1.7 nm from Gannet Rock daybeacon. You steer 308°T at 9.9 kn until 1135, then 061°T at 7.1 kn until 1200.

   Give the 1200 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 1320 you fix your position 062°T, 2.9 nm from Heron Point Light. You steer 278°T at 5.7 kn until 1335, then 062°T at 5.2 kn until 1410.

   Give the 1410 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 1055 you fix your position 065°T, 1.8 nm from Heron Point Light. You steer 030°T at 8.9 kn until 1135, then 233°T at 5.6 kn until 1200.

   Give the 1200 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 0735 you fix your position 062°T, 2.7 nm from Westfield church spire. You steer 167°T at 4.1 kn until 0750, then 047°T at 6.1 kn until 0810.

   Give the 0810 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 1335 you fix your position 032°T, 3.0 nm from Gannet Rock daybeacon. You steer 209°T at 7.9 kn until 1345, then 334°T at 6.3 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  

7. At 1020 you fix your position 269°T, 2.0 nm from Tern Island tower. You steer 168°T at 4.8 kn until 1105, then 094°T at 5.5 kn until 1140.

   Give the 1140 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 1240 you fix your position 268°T, 1.1 nm from Gannet Rock daybeacon. You steer 259°T at 5.4 kn until 1310, then 312°T at 6.4 kn until 1355.

   Give the 1355 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