Worksheet 293 · Skill 3

Dead reckoning

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1. At 1135 you fix your position 094°T, 1.6 nm from Gannet Rock daybeacon. You steer 290°T at 6.7 kn until 1220, then 123°T at 5.2 kn until 1250.

   Give the 1250 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 1135 you fix your position 151°T, 2.7 nm from Tern Island tower. You steer 232°T at 5.4 kn until 1210, then 297°T at 5.9 kn until 1220.

   Give the 1220 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  

3. At 1010 you fix your position 351°T, 2.8 nm from Mill stack. You steer 330°T at 8.3 kn until 1035, then 250°T at 5.2 kn until 1045.

   Give the 1045 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 350°T, 2.6 nm from Mill stack. You steer 343°T at 4.8 kn until 0940, then 192°T at 7.3 kn until 1005.

   Give the 1005 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  

5. At 1035 you fix your position 085°T, 1.4 nm from Heron Point Light. You steer 074°T at 8.8 kn until 1045, then 221°T at 5.9 kn until 1055.

   Give the 1055 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 1210 you fix your position 055°T, 1.5 nm from Heron Point Light. You steer 087°T at 8.9 kn until 1245, then 018°T at 5.7 kn until 1255.

   Give the 1255 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 0905 you fix your position 039°T, 2.2 nm from Heron Point Light. You steer 121°T at 5.4 kn until 0920, then 337°T at 7.7 kn until 0950.

   Give the 0950 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 1415 you fix your position 031°T, 2.4 nm from Mill stack. You steer 306°T at 5.4 kn until 1435, then 080°T at 8.5 kn until 1455.

   Give the 1455 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