Worksheet 565 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 070°T, 1.7 nm from Gannet Rock daybeacon. You steer 029°T at 4.8 kn until 1425, then 163°T at 9.9 kn until 1440.

   Give the 1440 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  

2. At 0925 you fix your position 344°T, 1.8 nm from Tern Island tower. You steer 303°T at 4.7 kn until 0940, then 251°T at 5.9 kn until 0955.

   Give the 0955 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 0825 you fix your position 282°T, 1.4 nm from Gannet Rock daybeacon. You steer 052°T at 6.7 kn until 0850, then 342°T at 5.8 kn until 0905.

   Give the 0905 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 080°T, 3.4 nm from Westfield church spire. You steer 087°T at 6.2 kn until 1550, then 246°T at 6.6 kn until 1610.

   Give the 1610 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 0715 you fix your position 255°T, 1.7 nm from Tern Island tower. You steer 150°T at 5.6 kn until 0800, then 281°T at 6.1 kn until 0825.

   Give the 0825 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 1505 you fix your position 109°T, 1.8 nm from Westfield church spire. You steer 098°T at 4.7 kn until 1520, then 038°T at 9.1 kn until 1550.

   Give the 1550 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 0800 you fix your position 242°T, 3.5 nm from Tern Island tower. You steer 294°T at 6.2 kn until 0835, then 148°T at 9.1 kn until 0900.

   Give the 0900 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 1305 you fix your position 080°T, 3.0 nm from Westfield church spire. You steer 350°T at 8.2 kn until 1320, then 290°T at 6.5 kn until 1335.

   Give the 1335 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