Worksheet 160 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 068°T, 3.2 nm from Westfield church spire. You steer 329°T at 5.3 kn until 1530, then 095°T at 6.9 kn until 1600.

   Give the 1600 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 1540 you fix your position 089°T, 0.8 nm from Gannet Rock daybeacon. You steer 341°T at 7.5 kn until 1610, then 300°T at 4.6 kn until 1630.

   Give the 1630 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  

3. At 1350 you fix your position 040°T, 2.2 nm from Mill stack. You steer 016°T at 4.6 kn until 1425, then 260°T at 4.5 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  

4. At 1255 you fix your position 324°T, 2.1 nm from Tern Island tower. You steer 206°T at 9.9 kn until 1325, then 103°T at 4.9 kn until 1350.

   Give the 1350 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 0720 you fix your position 054°T, 1.6 nm from Westfield church spire. You steer 351°T at 5.2 kn until 0740, then 171°T at 6.3 kn until 0820.

   Give the 0820 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 1240 you fix your position 014°T, 2.0 nm from Kittle water tank. You steer 318°T at 4.3 kn until 1250, then 257°T at 5.6 kn until 1315.

   Give the 1315 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 1245 you fix your position 019°T, 2.7 nm from Mill stack. You steer 321°T at 9.6 kn until 1310, then 192°T at 8.3 kn until 1330.

   Give the 1330 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 1450 you fix your position 076°T, 3.6 nm from Westfield church spire. You steer 137°T at 6.4 kn until 1525, then 284°T at 9.1 kn until 1550.

   Give the 1550 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