Worksheet 324 · Skill 3

Dead reckoning

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1. At 1600 you fix your position 046°T, 2.6 nm from Mill stack. You steer 356°T at 5.5 kn until 1630, then 059°T at 7.6 kn until 1700.

   Give the 1700 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  

2. At 1035 you fix your position 236°T, 2.6 nm from Tern Island tower. You steer 314°T at 9.8 kn until 1045, then 138°T at 6.1 kn until 1120.

   Give the 1120 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 1500 you fix your position 062°T, 5.1 nm from Tern Island tower. You steer 267°T at 8.4 kn until 1545, then 219°T at 5.4 kn until 1620.

   Give the 1620 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  

4. At 1420 you fix your position 057°T, 3.9 nm from Westfield church spire. You steer 279°T at 7.6 kn until 1445, then 130°T at 7.8 kn until 1525.

   Give the 1525 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  

5. At 1225 you fix your position 124°T, 1.5 nm from Tern Island tower. You steer 153°T at 7.3 kn until 1235, then 117°T at 4.1 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  

6. At 1540 you fix your position 267°T, 3.6 nm from Tern Island tower. You steer 058°T at 4.5 kn until 1625, then 282°T at 7.4 kn until 1655.

   Give the 1655 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 1550 you fix your position 029°T, 1.5 nm from Westfield church spire. You steer 098°T at 6.8 kn until 1625, then 167°T at 9.5 kn until 1655.

   Give the 1655 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  

8. At 1235 you fix your position 261°T, 2.5 nm from Gannet Rock daybeacon. You steer 285°T at 7.4 kn until 1320, then 199°T at 8.0 kn until 1330.

   Give the 1330 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