Worksheet 774 · Skill 3

Dead reckoning

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1. At 1055 you fix your position 251°T, 1.7 nm from Gannet Rock daybeacon. You steer 019°T at 5.3 kn until 1105, then 123°T at 4.1 kn until 1145.

   Give the 1145 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 0955 you fix your position 023°T, 3.6 nm from Westfield church spire. You steer 152°T at 9.5 kn until 1005, then 248°T at 4.8 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 1510 you fix your position 029°T, 3.2 nm from Westfield church spire. You steer 121°T at 9.5 kn until 1555, then 039°T at 7.5 kn until 1615.

   Give the 1615 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 1515 you fix your position 342°T, 2.2 nm from Mill stack. You steer 294°T at 9.8 kn until 1535, then 107°T at 8.4 kn until 1620.

   Give the 1620 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 1420 you fix your position 341°T, 1.9 nm from Heron Point Light. You steer 355°T at 6.3 kn until 1450, then 052°T at 9.9 kn until 1500.

   Give the 1500 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 0715 you fix your position 052°T, 3.3 nm from Tern Island tower. You steer 152°T at 6.6 kn until 0730, then 343°T at 4.6 kn until 0745.

   Give the 0745 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  

7. At 1150 you fix your position 028°T, 1.9 nm from Gannet Rock daybeacon. You steer 111°T at 4.7 kn until 1210, then 033°T at 9.9 kn until 1220.

   Give the 1220 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 1125 you fix your position 061°T, 3.4 nm from Heron Point Light. You steer 232°T at 5.5 kn until 1140, then 101°T at 8.5 kn until 1155.

   Give the 1155 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