Worksheet 626 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 074°T, 3.1 nm from Tern Island tower. You steer 071°T at 5.4 kn until 0815, then 302°T at 4.2 kn until 0825.

   Give the 0825 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 1455 you fix your position 270°T, 1.8 nm from Tern Island tower. You steer 192°T at 5.2 kn until 1510, then 295°T at 9.0 kn until 1525.

   Give the 1525 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 1015 you fix your position 275°T, 2.6 nm from Tern Island tower. You steer 226°T at 5.4 kn until 1030, then 352°T at 4.0 kn until 1115.

   Give the 1115 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 1105 you fix your position 052°T, 2.7 nm from Heron Point Light. You steer 264°T at 4.8 kn until 1125, then 333°T at 7.9 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  

5. At 1550 you fix your position 094°T, 3.4 nm from Westfield church spire. You steer 295°T at 4.8 kn until 1630, then 100°T at 7.9 kn until 1710.

   Give the 1710 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 1445 you fix your position 255°T, 1.7 nm from Gannet Rock daybeacon. You steer 256°T at 10.0 kn until 1455, then 140°T at 7.6 kn until 1515.

   Give the 1515 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  

7. At 0750 you fix your position 032°T, 3.0 nm from Heron Point Light. You steer 236°T at 4.0 kn until 0830, then 103°T at 8.8 kn until 0840.

   Give the 0840 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 227°T, 1.9 nm from Tern Island tower. You steer 003°T at 4.1 kn until 1400, then 278°T at 8.0 kn until 1420.

   Give the 1420 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