Worksheet 629 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 213°T, 3.0 nm from Tern Island tower. You steer 133°T at 4.1 kn until 1435, then 256°T at 6.7 kn until 1450.

   Give the 1450 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 0900 you fix your position 218°T, 3.2 nm from Tern Island tower. You steer 262°T at 6.8 kn until 0935, then 034°T at 9.0 kn until 1015.

   Give the 1015 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  

3. At 0710 you fix your position 298°T, 1.2 nm from Gannet Rock daybeacon. You steer 089°T at 7.4 kn until 0720, then 058°T at 6.4 kn until 0750.

   Give the 0750 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  

4. At 1005 you fix your position 047°T, 3.2 nm from Tern Island tower. You steer 153°T at 4.3 kn until 1050, then 305°T at 8.1 kn until 1105.

   Give the 1105 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 0955 you fix your position 048°T, 3.1 nm from Westfield church spire. You steer 158°T at 6.6 kn until 1025, then 196°T at 5.4 kn until 1040.

   Give the 1040 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  

6. At 1230 you fix your position 297°T, 1.4 nm from Tern Island tower. You steer 264°T at 9.6 kn until 1240, then 182°T at 4.9 kn until 1250.

   Give the 1250 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 1350 you fix your position 245°T, 3.4 nm from Tern Island tower. You steer 187°T at 5.8 kn until 1400, then 045°T at 4.9 kn until 1420.

   Give the 1420 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 1020 you fix your position 006°T, 2.9 nm from Mill stack. You steer 287°T at 6.4 kn until 1055, then 099°T at 4.0 kn until 1130.

   Give the 1130 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