Worksheet 573 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 292°T, 2.5 nm from Tern Island tower. You steer 174°T at 5.8 kn until 1600, then 132°T at 5.6 kn until 1645.

   Give the 1645 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 1310 you fix your position 064°T, 2.0 nm from Westfield church spire. You steer 075°T at 7.9 kn until 1320, then 157°T at 8.9 kn until 1335.

   Give the 1335 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 1230 you fix your position 320°T, 1.3 nm from Gannet Rock daybeacon. You steer 190°T at 8.1 kn until 1255, then 262°T at 7.5 kn until 1320.

   Give the 1320 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  

4. At 1230 you fix your position 044°T, 3.8 nm from Westfield church spire. You steer 168°T at 8.6 kn until 1240, then 201°T at 9.1 kn until 1250.

   Give the 1250 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  

5. At 0725 you fix your position 355°T, 3.0 nm from Mill stack. You steer 129°T at 8.7 kn until 0740, then 320°T at 6.6 kn until 0800.

   Give the 0800 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  

6. At 1305 you fix your position 000°T, 2.8 nm from Mill stack. You steer 229°T at 8.2 kn until 1320, then 028°T at 6.1 kn until 1335.

   Give the 1335 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  

7. At 0935 you fix your position 081°T, 1.5 nm from Heron Point Light. You steer 333°T at 5.7 kn until 1005, then 267°T at 7.1 kn until 1015.

   Give the 1015 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 0715 you fix your position 312°T, 1.6 nm from Tern Island tower. You steer 198°T at 7.7 kn until 0750, then 015°T at 4.0 kn until 0815.

   Give the 0815 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