Worksheet 140 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 281°T, 3.8 nm from Tern Island tower. You steer 055°T at 7.4 kn until 1610, then 142°T at 4.3 kn until 1625.

   Give the 1625 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 0940 you fix your position 254°T, 2.7 nm from Gannet Rock daybeacon. You steer 005°T at 4.2 kn until 0955, then 219°T at 8.9 kn until 1005.

   Give the 1005 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  

3. At 0805 you fix your position 076°T, 2.8 nm from Gannet Rock daybeacon. You steer 270°T at 7.7 kn until 0845, then 305°T at 7.5 kn until 0920.

   Give the 0920 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  

4. At 0705 you fix your position 023°T, 2.4 nm from Mill stack. You steer 302°T at 7.9 kn until 0735, then 139°T at 5.9 kn until 0820.

   Give the 0820 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 0705 you fix your position 026°T, 2.2 nm from Westfield church spire. You steer 112°T at 4.7 kn until 0720, then 256°T at 5.3 kn until 0740.

   Give the 0740 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 1005 you fix your position 096°T, 2.8 nm from Westfield church spire. You steer 040°T at 9.3 kn until 1030, then 170°T at 5.9 kn until 1050.

   Give the 1050 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 1240 you fix your position 025°T, 3.4 nm from Westfield church spire. You steer 218°T at 4.8 kn until 1305, then 149°T at 9.3 kn until 1345.

   Give the 1345 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 1325 you fix your position 010°T, 1.3 nm from Gannet Rock daybeacon. You steer 243°T at 7.9 kn until 1355, then 038°T at 6.4 kn until 1410.

   Give the 1410 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