Worksheet 653 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 080°T, 3.2 nm from Westfield church spire. You steer 179°T at 4.2 kn until 1550, then 112°T at 6.7 kn until 1620.

   Give the 1620 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  

2. At 1300 you fix your position 045°T, 3.0 nm from Gannet Rock daybeacon. You steer 164°T at 8.2 kn until 1320, then 289°T at 6.7 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  

3. At 1200 you fix your position 060°T, 2.2 nm from Heron Point Light. You steer 308°T at 4.2 kn until 1210, then 098°T at 4.3 kn until 1230.

   Give the 1230 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 1015 you fix your position 220°T, 3.2 nm from Tern Island tower. You steer 138°T at 6.9 kn until 1030, then 074°T at 7.2 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  

5. At 1005 you fix your position 101°T, 1.2 nm from Gannet Rock daybeacon. You steer 314°T at 5.5 kn until 1035, then 054°T at 6.1 kn until 1120.

   Give the 1120 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 1255 you fix your position 263°T, 2.9 nm from Gannet Rock daybeacon. You steer 348°T at 5.5 kn until 1335, then 223°T at 5.9 kn until 1410.

   Give the 1410 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  

7. At 0800 you fix your position 253°T, 3.5 nm from Tern Island tower. You steer 292°T at 9.9 kn until 0815, then 067°T at 8.1 kn until 0850.

   Give the 0850 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  

8. At 0920 you fix your position 219°T, 2.3 nm from Gannet Rock daybeacon. You steer 009°T at 8.6 kn until 0940, then 157°T at 4.5 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