Worksheet 661 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 259°T, 1.9 nm from Gannet Rock daybeacon. You steer 050°T at 4.5 kn until 1540, then 248°T at 4.8 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 0930 you fix your position 237°T, 2.7 nm from Tern Island tower. You steer 275°T at 6.1 kn until 1010, then 081°T at 9.3 kn until 1020.

   Give the 1020 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 0840 you fix your position 061°T, 1.9 nm from Gannet Rock daybeacon. You steer 263°T at 7.8 kn until 0905, then 310°T at 5.5 kn until 0925.

   Give the 0925 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  

4. At 1220 you fix your position 223°T, 3.4 nm from Tern Island tower. You steer 054°T at 6.2 kn until 1235, then 339°T at 5.4 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  

5. At 1545 you fix your position 033°T, 3.0 nm from Westfield church spire. You steer 188°T at 7.0 kn until 1620, then 031°T at 8.6 kn until 1635.

   Give the 1635 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 1320 you fix your position 086°T, 2.6 nm from Westfield church spire. You steer 101°T at 4.5 kn until 1405, then 187°T at 4.9 kn until 1430.

   Give the 1430 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 1010 you fix your position 028°T, 3.6 nm from Westfield church spire. You steer 197°T at 9.1 kn until 1020, then 003°T at 5.9 kn until 1040.

   Give the 1040 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 1250 you fix your position 213°T, 2.5 nm from Tern Island tower. You steer 248°T at 7.4 kn until 1315, then 124°T at 6.6 kn until 1350.

   Give the 1350 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