Worksheet 531 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 015°T, 2.6 nm from Westfield church spire. You steer 153°T at 4.1 kn until 1430, then 108°T at 6.2 kn until 1445.

   Give the 1445 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 0805 you fix your position 264°T, 2.7 nm from Tern Island tower. You steer 254°T at 4.8 kn until 0825, then 317°T at 5.9 kn until 0905.

   Give the 0905 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 1550 you fix your position 018°T, 1.8 nm from Mill stack. You steer 289°T at 7.0 kn until 1620, then 042°T at 8.9 kn until 1640.

   Give the 1640 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 1325 you fix your position 242°T, 3.5 nm from Tern Island tower. You steer 245°T at 5.4 kn until 1340, then 331°T at 6.2 kn until 1425.

   Give the 1425 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 1030 you fix your position 329°T, 2.3 nm from Mill stack. You steer 353°T at 4.8 kn until 1110, then 248°T at 9.6 kn until 1120.

   Give the 1120 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  

6. At 0715 you fix your position 028°T, 3.8 nm from Westfield church spire. You steer 142°T at 8.3 kn until 0745, then 322°T at 6.6 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  

7. At 1225 you fix your position 064°T, 1.5 nm from Heron Point Light. You steer 293°T at 4.5 kn until 1245, then 060°T at 6.6 kn until 1255.

   Give the 1255 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 0755 you fix your position 257°T, 1.9 nm from Gannet Rock daybeacon. You steer 204°T at 9.5 kn until 0805, then 250°T at 4.1 kn until 0815.

   Give the 0815 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