Worksheet 281 · Skill 3

Dead reckoning

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1. At 0820 you fix your position 258°T, 3.1 nm from Tern Island tower. You steer 061°T at 6.4 kn until 0830, then 314°T at 7.5 kn until 0900.

   Give the 0900 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  

2. At 1510 you fix your position 256°T, 2.7 nm from Tern Island tower. You steer 204°T at 7.4 kn until 1530, then 352°T at 6.0 kn until 1615.

   Give the 1615 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 1125 you fix your position 028°T, 2.4 nm from Westfield church spire. You steer 035°T at 4.1 kn until 1145, then 107°T at 4.7 kn until 1210.

   Give the 1210 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 1500 you fix your position 233°T, 3.4 nm from Tern Island tower. You steer 112°T at 6.2 kn until 1510, then 254°T at 6.8 kn until 1545.

   Give the 1545 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 1530 you fix your position 081°T, 2.7 nm from Tern Island tower. You steer 170°T at 6.7 kn until 1605, then 261°T at 8.0 kn until 1650.

   Give the 1650 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 1440 you fix your position 039°T, 2.7 nm from Heron Point Light. You steer 231°T at 6.2 kn until 1450, then 353°T at 9.4 kn until 1510.

   Give the 1510 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 0745 you fix your position 123°T, 1.7 nm from Westfield church spire. You steer 153°T at 4.0 kn until 0810, then 059°T at 9.0 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  

8. At 0700 you fix your position 224°T, 1.3 nm from Gannet Rock daybeacon. You steer 283°T at 5.5 kn until 0745, then 074°T at 8.7 kn until 0810.

   Give the 0810 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