Worksheet 35 · Skill 3

Dead reckoning

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1. At 1525 you fix your position 357°T, 3.2 nm from Mill stack. You steer 342°T at 7.6 kn until 1610, then 173°T at 7.8 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  

2. At 0915 you fix your position 047°T, 3.3 nm from Westfield church spire. You steer 098°T at 9.0 kn until 0930, then 154°T at 4.6 kn until 1010.

   Give the 1010 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 1310 you fix your position 067°T, 2.0 nm from Tern Island tower. You steer 194°T at 8.3 kn until 1325, then 037°T at 4.4 kn until 1350.

   Give the 1350 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 1535 you fix your position 056°T, 2.0 nm from Westfield church spire. You steer 116°T at 7.8 kn until 1600, then 018°T at 9.0 kn until 1620.

   Give the 1620 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  

5. At 0835 you fix your position 069°T, 3.4 nm from Westfield church spire. You steer 183°T at 4.2 kn until 0905, then 136°T at 7.9 kn until 0925.

   Give the 0925 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 1325 you fix your position 029°T, 3.3 nm from Westfield church spire. You steer 180°T at 6.3 kn until 1410, then 076°T at 8.3 kn until 1420.

   Give the 1420 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  

7. At 0725 you fix your position 049°T, 1.8 nm from Heron Point Light. You steer 058°T at 8.6 kn until 0735, then 302°T at 7.6 kn until 0810.

   Give the 0810 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 1425 you fix your position 265°T, 1.9 nm from Tern Island tower. You steer 214°T at 5.8 kn until 1435, then 287°T at 6.7 kn until 1445.

   Give the 1445 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