Worksheet 795 · Skill 3

Dead reckoning

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1. At 1555 you fix your position 214°T, 2.2 nm from Tern Island tower. You steer 231°T at 9.6 kn until 1605, then 282°T at 9.2 kn until 1615.

   Give the 1615 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 1245 you fix your position 038°T, 1.8 nm from Heron Point Light. You steer 356°T at 5.0 kn until 1315, then 200°T at 7.6 kn until 1330.

   Give the 1330 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 1315 you fix your position 007°T, 1.5 nm from Gannet Rock daybeacon. You steer 352°T at 9.1 kn until 1330, then 125°T at 4.8 kn until 1345.

   Give the 1345 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 1015 you fix your position 088°T, 2.8 nm from Westfield church spire. You steer 195°T at 4.1 kn until 1040, then 335°T at 4.9 kn until 1100.

   Give the 1100 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 1155 you fix your position 237°T, 2.1 nm from Gannet Rock daybeacon. You steer 085°T at 6.0 kn until 1220, then 240°T at 5.8 kn until 1255.

   Give the 1255 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  

6. At 1455 you fix your position 030°T, 2.8 nm from Heron Point Light. You steer 126°T at 5.7 kn until 1520, then 324°T at 4.3 kn until 1530.

   Give the 1530 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 1235 you fix your position 239°T, 3.3 nm from Tern Island tower. You steer 075°T at 5.7 kn until 1250, then 292°T at 8.9 kn until 1325.

   Give the 1325 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  

8. At 0850 you fix your position 260°T, 3.2 nm from Gannet Rock daybeacon. You steer 295°T at 7.2 kn until 0900, then 332°T at 4.0 kn until 0925.

   Give the 0925 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