Worksheet 379 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 288°T, 3.3 nm from Tern Island tower. You steer 188°T at 6.9 kn until 1020, then 123°T at 5.0 kn until 1040.

   Give the 1040 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  

2. At 0730 you fix your position 354°T, 1.5 nm from Tern Island tower. You steer 114°T at 7.4 kn until 0755, then 335°T at 6.1 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  

3. At 1315 you fix your position 315°T, 3.0 nm from Tern Island tower. You steer 258°T at 5.8 kn until 1355, then 105°T at 9.2 kn until 1415.

   Give the 1415 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 0740 you fix your position 111°T, 1.7 nm from Westfield church spire. You steer 351°T at 4.3 kn until 0755, then 123°T at 5.0 kn until 0815.

   Give the 0815 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 1425 you fix your position 038°T, 4.0 nm from Gannet Rock daybeacon. You steer 288°T at 9.6 kn until 1500, then 092°T at 8.9 kn until 1515.

   Give the 1515 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  

6. At 1005 you fix your position 222°T, 3.3 nm from Tern Island tower. You steer 051°T at 6.7 kn until 1015, then 232°T at 8.3 kn until 1035.

   Give the 1035 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 1250 you fix your position 084°T, 1.9 nm from Tern Island tower. You steer 323°T at 6.8 kn until 1305, then 149°T at 8.7 kn until 1340.

   Give the 1340 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  

8. At 0905 you fix your position 043°T, 4.6 nm from Westfield church spire. You steer 154°T at 9.0 kn until 0930, then 095°T at 6.8 kn until 1015.

   Give the 1015 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