Worksheet 763 · Skill 3

Dead reckoning

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1. At 0950 you fix your position 233°T, 0.9 nm from Gannet Rock daybeacon. You steer 263°T at 4.8 kn until 1035, then 122°T at 8.0 kn until 1100.

   Give the 1100 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 0715 you fix your position 055°T, 2.3 nm from Westfield church spire. You steer 301°T at 8.6 kn until 0730, then 156°T at 5.9 kn until 0740.

   Give the 0740 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 0750 you fix your position 092°T, 1.9 nm from Westfield church spire. You steer 139°T at 9.9 kn until 0810, then 322°T at 6.0 kn until 0845.

   Give the 0845 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  

4. At 0905 you fix your position 303°T, 4.2 nm from Tern Island tower. You steer 127°T at 6.6 kn until 0925, then 183°T at 5.5 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  

5. At 0930 you fix your position 122°T, 1.4 nm from Westfield church spire. You steer 069°T at 9.6 kn until 0945, then 108°T at 9.1 kn until 1015.

   Give the 1015 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  

6. At 1320 you fix your position 350°T, 2.4 nm from Mill stack. You steer 334°T at 6.8 kn until 1400, then 151°T at 5.3 kn until 1445.

   Give the 1445 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 0900 you fix your position 200°T, 2.5 nm from Tern Island tower. You steer 141°T at 6.3 kn until 0910, then 034°T at 9.7 kn until 0925.

   Give the 0925 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  

8. At 1505 you fix your position 256°T, 2.6 nm from Tern Island tower. You steer 051°T at 4.9 kn until 1545, then 121°T at 6.8 kn until 1600.

   Give the 1600 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