Worksheet 771 · Skill 3

Dead reckoning

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1. At 1440 you fix your position 077°T, 1.8 nm from Heron Point Light. You steer 003°T at 8.2 kn until 1500, then 054°T at 6.9 kn until 1510.

   Give the 1510 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 1145 you fix your position 070°T, 1.8 nm from Westfield church spire. You steer 301°T at 4.3 kn until 1205, then 158°T at 9.8 kn until 1230.

   Give the 1230 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 1440 you fix your position 073°T, 3.7 nm from Tern Island tower. You steer 282°T at 9.7 kn until 1455, then 158°T at 6.3 kn until 1530.

   Give the 1530 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  

4. At 1220 you fix your position 050°T, 3.1 nm from Westfield church spire. You steer 223°T at 4.4 kn until 1230, then 102°T at 8.0 kn until 1300.

   Give the 1300 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 1100 you fix your position 251°T, 1.3 nm from Gannet Rock daybeacon. You steer 251°T at 6.2 kn until 1110, then 285°T at 8.5 kn until 1145.

   Give the 1145 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 1245 you fix your position 045°T, 1.7 nm from Gannet Rock daybeacon. You steer 079°T at 8.0 kn until 1300, then 346°T at 6.4 kn until 1325.

   Give the 1325 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  

7. At 0705 you fix your position 258°T, 3.0 nm from Gannet Rock daybeacon. You steer 046°T at 7.9 kn until 0745, then 215°T at 6.1 kn until 0820.

   Give the 0820 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 0725 you fix your position 292°T, 3.9 nm from Tern Island tower. You steer 156°T at 7.9 kn until 0740, then 255°T at 6.1 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