Worksheet 50 · Skill 3

Dead reckoning

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1. At 0840 you fix your position 047°T, 4.2 nm from Westfield church spire. You steer 091°T at 8.5 kn until 0920, then 260°T at 5.1 kn until 0930.

   Give the 0930 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  

2. At 0710 you fix your position 241°T, 2.5 nm from Gannet Rock daybeacon. You steer 175°T at 9.5 kn until 0720, then 292°T at 6.5 kn until 0745.

   Give the 0745 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 1545 you fix your position 042°T, 4.6 nm from Westfield church spire. You steer 182°T at 4.7 kn until 1620, then 051°T at 7.4 kn until 1650.

   Give the 1650 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 0850 you fix your position 037°T, 2.7 nm from Tern Island tower. You steer 275°T at 4.1 kn until 0910, then 122°T at 6.7 kn until 0930.

   Give the 0930 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 1350 you fix your position 007°T, 1.5 nm from Gannet Rock daybeacon. You steer 001°T at 8.0 kn until 1400, then 161°T at 6.3 kn until 1425.

   Give the 1425 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 1040 you fix your position 242°T, 1.7 nm from Tern Island tower. You steer 216°T at 5.8 kn until 1110, then 347°T at 5.5 kn until 1125.

   Give the 1125 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  

7. At 1430 you fix your position 135°T, 1.4 nm from Westfield church spire. You steer 027°T at 9.9 kn until 1500, then 181°T at 6.0 kn until 1540.

   Give the 1540 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 1120 you fix your position 291°T, 2.9 nm from Tern Island tower. You steer 187°T at 7.3 kn until 1150, then 300°T at 8.9 kn until 1215.

   Give the 1215 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