Worksheet 99 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 218°T, 2.4 nm from Gannet Rock daybeacon. You steer 071°T at 5.8 kn until 1530, then 357°T at 5.0 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  

2. At 1440 you fix your position 109°T, 0.8 nm from Gannet Rock daybeacon. You steer 147°T at 9.4 kn until 1455, then 006°T at 7.0 kn until 1520.

   Give the 1520 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 1050 you fix your position 019°T, 2.0 nm from Gannet Rock daybeacon. You steer 067°T at 5.4 kn until 1100, then 216°T at 6.7 kn until 1110.

   Give the 1110 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 0955 you fix your position 245°T, 1.8 nm from Tern Island tower. You steer 175°T at 4.0 kn until 1020, then 112°T at 4.9 kn until 1100.

   Give the 1100 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 1040 you fix your position 346°T, 1.1 nm from Kittle water tank. You steer 282°T at 8.9 kn until 1125, then 050°T at 8.2 kn until 1145.

   Give the 1145 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 0910 you fix your position 003°T, 1.9 nm from Heron Point Light. You steer 356°T at 9.3 kn until 0925, then 107°T at 7.6 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  

7. At 1145 you fix your position 018°T, 0.9 nm from Gannet Rock daybeacon. You steer 353°T at 5.4 kn until 1215, then 121°T at 6.8 kn until 1230.

   Give the 1230 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 1130 you fix your position 255°T, 2.6 nm from Gannet Rock daybeacon. You steer 333°T at 5.3 kn until 1155, then 274°T at 8.1 kn until 1230.

   Give the 1230 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