Worksheet 252 · Skill 3

Dead reckoning

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1. At 0915 you fix your position 155°T, 3.1 nm from Tern Island tower. You steer 306°T at 4.7 kn until 0935, then 075°T at 8.0 kn until 0945.

   Give the 0945 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 0800 you fix your position 287°T, 2.9 nm from Tern Island tower. You steer 176°T at 6.0 kn until 0815, then 216°T at 7.1 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  

3. At 1410 you fix your position 013°T, 2.2 nm from Gannet Rock daybeacon. You steer 032°T at 6.0 kn until 1430, then 114°T at 6.5 kn until 1440.

   Give the 1440 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 1520 you fix your position 022°T, 3.7 nm from Westfield church spire. You steer 176°T at 6.3 kn until 1545, then 119°T at 4.0 kn until 1630.

   Give the 1630 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 0825 you fix your position 099°T, 2.5 nm from Westfield church spire. You steer 022°T at 4.4 kn until 0905, then 215°T at 8.3 kn until 0935.

   Give the 0935 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  

6. At 1115 you fix your position 000°T, 2.4 nm from Tern Island tower. You steer 098°T at 4.2 kn until 1145, then 168°T at 8.3 kn until 1215.

   Give the 1215 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 1320 you fix your position 025°T, 2.8 nm from Gannet Rock daybeacon. You steer 304°T at 4.7 kn until 1405, then 231°T at 6.5 kn until 1450.

   Give the 1450 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  

8. At 1230 you fix your position 048°T, 3.6 nm from Westfield church spire. You steer 199°T at 6.0 kn until 1250, then 095°T at 7.6 kn until 1305.

   Give the 1305 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