Worksheet 502 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 026°T, 1.6 nm from Tern Island tower. You steer 286°T at 8.6 kn until 0745, then 215°T at 8.3 kn until 0825.

   Give the 0825 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 0810 you fix your position 024°T, 1.2 nm from Westfield church spire. You steer 106°T at 9.7 kn until 0820, then 282°T at 4.5 kn until 0840.

   Give the 0840 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  

3. At 0925 you fix your position 054°T, 2.7 nm from Gannet Rock daybeacon. You steer 176°T at 5.1 kn until 0945, then 352°T at 5.9 kn until 1030.

   Give the 1030 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 1535 you fix your position 052°T, 1.8 nm from Tern Island tower. You steer 323°T at 7.3 kn until 1550, then 264°T at 5.1 kn until 1635.

   Give the 1635 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 0815 you fix your position 071°T, 1.9 nm from Westfield church spire. You steer 160°T at 7.2 kn until 0850, then 345°T at 8.3 kn until 0900.

   Give the 0900 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 1515 you fix your position 038°T, 2.3 nm from Heron Point Light. You steer 149°T at 5.7 kn until 1525, then 084°T at 4.6 kn until 1550.

   Give the 1550 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  

7. At 1250 you fix your position 084°T, 1.3 nm from Westfield church spire. You steer 178°T at 6.2 kn until 1315, then 323°T at 4.8 kn until 1325.

   Give the 1325 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 1505 you fix your position 356°T, 2.3 nm from Mill stack. You steer 053°T at 8.5 kn until 1520, then 296°T at 7.3 kn until 1550.

   Give the 1550 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