Worksheet 285 · Skill 3

Dead reckoning

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1. At 1340 you fix your position 059°T, 3.4 nm from Westfield church spire. You steer 166°T at 7.3 kn until 1355, then 017°T at 9.4 kn until 1415.

   Give the 1415 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 1150 you fix your position 030°T, 3.1 nm from Heron Point Light. You steer 028°T at 9.4 kn until 1215, then 259°T at 4.3 kn until 1255.

   Give the 1255 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  

3. At 1210 you fix your position 353°T, 3.2 nm from Mill stack. You steer 285°T at 6.9 kn until 1245, then 092°T at 5.2 kn until 1310.

   Give the 1310 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  

4. At 1330 you fix your position 056°T, 2.5 nm from Heron Point Light. You steer 353°T at 10.0 kn until 1355, then 163°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  

5. At 1205 you fix your position 045°T, 3.3 nm from Heron Point Light. You steer 312°T at 6.5 kn until 1245, then 028°T at 6.5 kn until 1255.

   Give the 1255 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 0705 you fix your position 042°T, 4.0 nm from Gannet Rock daybeacon. You steer 159°T at 7.4 kn until 0715, then 254°T at 4.1 kn until 0735.

   Give the 0735 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 1150 you fix your position 015°T, 2.6 nm from Heron Point Light. You steer 093°T at 6.1 kn until 1210, then 159°T at 4.8 kn until 1245.

   Give the 1245 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

8. At 0805 you fix your position 056°T, 3.2 nm from Heron Point Light. You steer 092°T at 9.6 kn until 0825, then 146°T at 5.2 kn until 0845.

   Give the 0845 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