Worksheet 792 · Skill 3

Dead reckoning

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1. At 1435 you fix your position 093°T, 1.4 nm from Gannet Rock daybeacon. You steer 027°T at 5.4 kn until 1450, then 355°T at 6.0 kn until 1505.

   Give the 1505 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  

2. At 0905 you fix your position 232°T, 0.9 nm from Gannet Rock daybeacon. You steer 081°T at 7.1 kn until 0930, then 002°T at 4.9 kn until 0945.

   Give the 0945 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  

3. At 0820 you fix your position 072°T, 3.5 nm from Westfield church spire. You steer 200°T at 4.0 kn until 0835, then 251°T at 6.2 kn until 0900.

   Give the 0900 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 0830 you fix your position 060°T, 2.0 nm from Westfield church spire. You steer 359°T at 4.1 kn until 0845, then 181°T at 6.3 kn until 0915.

   Give the 0915 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 1245 you fix your position 033°T, 1.3 nm from Gannet Rock daybeacon. You steer 269°T at 4.3 kn until 1315, then 230°T at 6.7 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  

6. At 1315 you fix your position 343°T, 0.9 nm from Gannet Rock daybeacon. You steer 258°T at 8.3 kn until 1325, then 058°T at 7.1 kn until 1355.

   Give the 1355 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  

7. At 0800 you fix your position 285°T, 3.7 nm from Tern Island tower. You steer 144°T at 7.2 kn until 0825, then 205°T at 7.5 kn until 0835.

   Give the 0835 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  

8. At 1005 you fix your position 118°T, 2.2 nm from Westfield church spire. You steer 291°T at 4.4 kn until 1015, then 082°T at 9.7 kn until 1040.

   Give the 1040 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