Worksheet 183 · Skill 3

Dead reckoning

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1. At 1520 you fix your position 017°T, 1.4 nm from Westfield church spire. You steer 149°T at 6.7 kn until 1540, then 057°T at 8.3 kn until 1615.

   Give the 1615 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 1220 you fix your position 004°T, 2.7 nm from Mill stack. You steer 062°T at 6.6 kn until 1230, then 107°T at 6.5 kn until 1240.

   Give the 1240 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 1535 you fix your position 032°T, 3.0 nm from Heron Point Light. You steer 094°T at 5.4 kn until 1610, then 143°T at 10.0 kn until 1620.

   Give the 1620 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 1525 you fix your position 045°T, 2.6 nm from Heron Point Light. You steer 048°T at 6.9 kn until 1550, then 211°T at 9.4 kn until 1610.

   Give the 1610 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 1420 you fix your position 058°T, 3.9 nm from Westfield church spire. You steer 215°T at 8.0 kn until 1455, then 068°T at 8.7 kn until 1510.

   Give the 1510 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 1020 you fix your position 053°T, 4.0 nm from Westfield church spire. You steer 193°T at 5.4 kn until 1055, then 288°T at 4.8 kn until 1115.

   Give the 1115 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 0715 you fix your position 293°T, 3.3 nm from Tern Island tower. You steer 185°T at 8.0 kn until 0745, then 289°T at 4.2 kn until 0825.

   Give the 0825 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 1505 you fix your position 058°T, 3.4 nm from Gannet Rock daybeacon. You steer 236°T at 5.2 kn until 1535, then 064°T at 5.0 kn until 1605.

   Give the 1605 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