Worksheet 525 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 049°T, 2.9 nm from Westfield church spire. You steer 351°T at 6.0 kn until 0805, then 118°T at 8.9 kn until 0830.

   Give the 0830 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 0905 you fix your position 148°T, 3.2 nm from Westfield church spire. You steer 084°T at 5.0 kn until 0935, then 302°T at 5.3 kn until 1000.

   Give the 1000 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  

3. At 1140 you fix your position 090°T, 1.4 nm from Heron Point Light. You steer 059°T at 8.7 kn until 1225, then 101°T at 5.3 kn until 1300.

   Give the 1300 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 1010 you fix your position 047°T, 2.5 nm from Mill stack. You steer 041°T at 4.4 kn until 1020, then 225°T at 6.2 kn until 1040.

   Give the 1040 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  

5. At 0820 you fix your position 097°T, 1.4 nm from Heron Point Light. You steer 048°T at 6.3 kn until 0855, then 281°T at 9.8 kn until 0920.

   Give the 0920 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 1550 you fix your position 280°T, 1.6 nm from Gannet Rock daybeacon. You steer 196°T at 5.7 kn until 1610, then 109°T at 7.8 kn until 1625.

   Give the 1625 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

7. At 1435 you fix your position 242°T, 3.3 nm from Tern Island tower. You steer 138°T at 5.6 kn until 1445, then 210°T at 7.2 kn until 1500.

   Give the 1500 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 1030 you fix your position 036°T, 1.0 nm from Westfield church spire. You steer 067°T at 5.1 kn until 1045, then 188°T at 6.2 kn until 1120.

   Give the 1120 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