Worksheet 690 · Skill 3

Dead reckoning

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1. At 0710 you fix your position 065°T, 1.3 nm from Westfield church spire. You steer 144°T at 6.1 kn until 0755, then 348°T at 6.0 kn until 0835.

   Give the 0835 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 0700 you fix your position 177°T, 1.5 nm from Tern Island tower. You steer 173°T at 9.4 kn until 0710, then 288°T at 5.6 kn until 0755.

   Give the 0755 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 0845 you fix your position 278°T, 3.8 nm from Tern Island tower. You steer 271°T at 4.9 kn until 0905, then 167°T at 4.9 kn until 0935.

   Give the 0935 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 1520 you fix your position 251°T, 1.6 nm from Gannet Rock daybeacon. You steer 317°T at 6.0 kn until 1530, then 222°T at 5.2 kn until 1555.

   Give the 1555 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  

5. At 1245 you fix your position 058°T, 2.4 nm from Heron Point Light. You steer 049°T at 5.8 kn until 1305, then 167°T at 8.4 kn until 1315.

   Give the 1315 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 1055 you fix your position 057°T, 3.2 nm from Gannet Rock daybeacon. You steer 289°T at 6.9 kn until 1110, then 064°T at 5.6 kn until 1130.

   Give the 1130 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  

7. At 1155 you fix your position 265°T, 2.1 nm from Tern Island tower. You steer 044°T at 6.4 kn until 1205, then 261°T at 9.9 kn until 1220.

   Give the 1220 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 1330 you fix your position 001°T, 1.6 nm from Kittle water tank. You steer 255°T at 6.2 kn until 1405, then 067°T at 4.8 kn until 1425.

   Give the 1425 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