Worksheet 83 · Skill 3

Dead reckoning

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1. At 1310 you fix your position 249°T, 2.7 nm from Gannet Rock daybeacon. You steer 230°T at 4.5 kn until 1325, then 297°T at 8.1 kn until 1340.

   Give the 1340 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  

2. At 1350 you fix your position 253°T, 2.1 nm from Gannet Rock daybeacon. You steer 183°T at 8.1 kn until 1405, then 008°T at 5.8 kn until 1420.

   Give the 1420 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 1425 you fix your position 327°T, 2.3 nm from Mill stack. You steer 067°T at 8.5 kn until 1450, then 031°T at 6.2 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  

4. At 1050 you fix your position 220°T, 3.4 nm from Tern Island tower. You steer 247°T at 7.9 kn until 1115, then 073°T at 7.9 kn until 1135.

   Give the 1135 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 1150 you fix your position 010°T, 2.5 nm from Mill stack. You steer 121°T at 6.3 kn until 1210, then 301°T at 4.8 kn until 1230.

   Give the 1230 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 1300 you fix your position 130°T, 1.9 nm from Westfield church spire. You steer 048°T at 6.6 kn until 1330, then 217°T at 7.3 kn until 1400.

   Give the 1400 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  

7. At 0700 you fix your position 210°T, 2.3 nm from Tern Island tower. You steer 294°T at 4.3 kn until 0745, then 031°T at 4.7 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  

8. At 1435 you fix your position 000°T, 2.1 nm from Tern Island tower. You steer 265°T at 7.2 kn until 1455, then 172°T at 6.5 kn until 1510.

   Give the 1510 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