Worksheet 318 · Skill 3

Dead reckoning

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1. At 1210 you fix your position 082°T, 1.7 nm from Heron Point Light. You steer 028°T at 9.3 kn until 1220, then 175°T at 8.6 kn until 1235.

   Give the 1235 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 1015 you fix your position 081°T, 2.0 nm from Heron Point Light. You steer 015°T at 9.9 kn until 1045, then 147°T at 5.1 kn until 1130.

   Give the 1130 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 1035 you fix your position 300°T, 1.6 nm from Gannet Rock daybeacon. You steer 081°T at 9.0 kn until 1055, then 248°T at 5.9 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  

4. At 1555 you fix your position 226°T, 3.3 nm from Tern Island tower. You steer 068°T at 8.3 kn until 1610, then 153°T at 9.8 kn until 1625.

   Give the 1625 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 1335 you fix your position 034°T, 3.6 nm from Westfield church spire. You steer 220°T at 6.5 kn until 1400, then 042°T at 9.3 kn until 1410.

   Give the 1410 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 1135 you fix your position 001°T, 3.1 nm from Mill stack. You steer 011°T at 6.8 kn until 1155, then 287°T at 7.5 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  

7. At 0745 you fix your position 340°T, 1.7 nm from Heron Point Light. You steer 079°T at 6.7 kn until 0755, then 286°T at 4.3 kn until 0805.

   Give the 0805 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 0900 you fix your position 044°T, 2.3 nm from Heron Point Light. You steer 207°T at 5.5 kn until 0915, then 314°T at 9.9 kn until 0925.

   Give the 0925 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