Worksheet 666 · Skill 3

Dead reckoning

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1. At 1045 you fix your position 051°T, 2.7 nm from Heron Point Light. You steer 350°T at 7.4 kn until 1125, then 173°T at 9.4 kn until 1155.

   Give the 1155 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  

2. At 0935 you fix your position 110°T, 1.6 nm from Tern Island tower. You steer 224°T at 9.6 kn until 1015, then 045°T at 7.3 kn until 1035.

   Give the 1035 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 1015 you fix your position 020°T, 1.3 nm from Kittle water tank. You steer 002°T at 9.1 kn until 1055, then 212°T at 7.8 kn until 1120.

   Give the 1120 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 1055 you fix your position 006°T, 2.4 nm from Mill stack. You steer 260°T at 9.1 kn until 1110, then 333°T at 4.4 kn until 1150.

   Give the 1150 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  

5. At 1215 you fix your position 270°T, 2.1 nm from Tern Island tower. You steer 229°T at 7.6 kn until 1225, then 030°T at 9.9 kn until 1240.

   Give the 1240 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  

6. At 1310 you fix your position 227°T, 2.6 nm from Gannet Rock daybeacon. You steer 233°T at 5.4 kn until 1330, then 057°T at 8.2 kn until 1415.

   Give the 1415 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  

7. At 1305 you fix your position 350°T, 1.8 nm from Mill stack. You steer 266°T at 4.1 kn until 1320, then 002°T at 4.7 kn until 1350.

   Give the 1350 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  

8. At 1130 you fix your position 011°T, 1.0 nm from Heron Point Light. You steer 094°T at 9.7 kn until 1140, then 341°T at 7.0 kn until 1220.

   Give the 1220 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