Worksheet 364 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 056°T, 2.8 nm from Westfield church spire. You steer 219°T at 8.5 kn until 1305, then 083°T at 6.3 kn until 1320.

   Give the 1320 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 0730 you fix your position 213°T, 2.1 nm from Tern Island tower. You steer 084°T at 8.7 kn until 0750, then 134°T at 9.5 kn until 0810.

   Give the 0810 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

3. At 1510 you fix your position 293°T, 3.3 nm from Tern Island tower. You steer 173°T at 4.0 kn until 1555, then 026°T at 7.3 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  

4. At 1210 you fix your position 012°T, 1.9 nm from Heron Point Light. You steer 102°T at 9.8 kn until 1250, then 060°T at 7.0 kn until 1320.

   Give the 1320 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  

5. At 1145 you fix your position 084°T, 1.3 nm from Westfield church spire. You steer 149°T at 7.4 kn until 1155, then 323°T at 4.4 kn until 1235.

   Give the 1235 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 0820 you fix your position 258°T, 2.6 nm from Tern Island tower. You steer 204°T at 7.2 kn until 0840, then 104°T at 5.5 kn until 0850.

   Give the 0850 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 0730 you fix your position 194°T, 1.9 nm from Gannet Rock daybeacon. You steer 274°T at 4.2 kn until 0750, then 223°T at 6.0 kn until 0805.

   Give the 0805 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  

8. At 1205 you fix your position 336°T, 2.7 nm from Tern Island tower. You steer 218°T at 6.3 kn until 1240, then 135°T at 6.2 kn until 1305.

   Give the 1305 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