Worksheet 523 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 267°T, 1.7 nm from Tern Island tower. You steer 339°T at 5.6 kn until 1120, then 267°T at 9.5 kn until 1150.

   Give the 1150 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 1340 you fix your position 032°T, 3.0 nm from Westfield church spire. You steer 163°T at 9.8 kn until 1355, then 337°T at 5.6 kn until 1415.

   Give the 1415 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  

3. At 1305 you fix your position 290°T, 2.7 nm from Tern Island tower. You steer 244°T at 4.7 kn until 1320, then 345°T at 4.8 kn until 1330.

   Give the 1330 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 1510 you fix your position 275°T, 1.5 nm from Gannet Rock daybeacon. You steer 184°T at 4.4 kn until 1540, then 294°T at 6.4 kn until 1615.

   Give the 1615 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  

5. At 0835 you fix your position 040°T, 3.8 nm from Westfield church spire. You steer 084°T at 7.3 kn until 0910, then 232°T at 9.3 kn until 0930.

   Give the 0930 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 1335 you fix your position 282°T, 1.4 nm from Gannet Rock daybeacon. You steer 062°T at 8.1 kn until 1355, then 029°T at 8.7 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  

7. At 0710 you fix your position 059°T, 2.3 nm from Westfield church spire. You steer 176°T at 10.0 kn until 0725, then 295°T at 9.4 kn until 0735.

   Give the 0735 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  

8. At 0850 you fix your position 252°T, 3.5 nm from Tern Island tower. You steer 145°T at 6.6 kn until 0915, then 343°T at 5.5 kn until 0935.

   Give the 0935 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