Worksheet 56 · Skill 3

Dead reckoning

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1. At 0715 you fix your position 292°T, 2.3 nm from Tern Island tower. You steer 209°T at 8.9 kn until 0740, then 143°T at 8.5 kn until 0800.

   Give the 0800 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 1245 you fix your position 289°T, 1.7 nm from Gannet Rock daybeacon. You steer 245°T at 6.4 kn until 1320, then 083°T at 9.2 kn until 1345.

   Give the 1345 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  

3. At 1345 you fix your position 348°T, 3.1 nm from Mill stack. You steer 274°T at 5.6 kn until 1415, then 304°T at 5.8 kn until 1430.

   Give the 1430 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 1005 you fix your position 034°T, 1.5 nm from Gannet Rock daybeacon. You steer 237°T at 4.6 kn until 1020, then 112°T at 6.0 kn until 1050.

   Give the 1050 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 1205 you fix your position 111°T, 1.4 nm from Gannet Rock daybeacon. You steer 102°T at 6.4 kn until 1215, then 003°T at 5.6 kn until 1245.

   Give the 1245 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 0915 you fix your position 338°T, 1.5 nm from Heron Point Light. You steer 300°T at 7.0 kn until 0925, then 048°T at 8.3 kn until 1005.

   Give the 1005 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 1105 you fix your position 021°T, 2.7 nm from Westfield church spire. You steer 121°T at 5.5 kn until 1150, then 163°T at 4.3 kn until 1200.

   Give the 1200 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 1030 you fix your position 265°T, 3.6 nm from Tern Island tower. You steer 170°T at 7.1 kn until 1050, then 095°T at 4.4 kn until 1110.

   Give the 1110 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