Worksheet 325 · Skill 3

Dead reckoning

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1. At 1135 you fix your position 084°T, 2.1 nm from Gannet Rock daybeacon. You steer 157°T at 4.3 kn until 1145, then 000°T at 9.2 kn until 1200.

   Give the 1200 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 1140 you fix your position 040°T, 3.0 nm from Heron Point Light. You steer 223°T at 8.0 kn until 1150, then 082°T at 5.4 kn until 1225.

   Give the 1225 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 1310 you fix your position 083°T, 2.2 nm from Gannet Rock daybeacon. You steer 295°T at 4.6 kn until 1335, then 145°T at 9.8 kn until 1400.

   Give the 1400 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  

4. At 1020 you fix your position 066°T, 2.0 nm from Gannet Rock daybeacon. You steer 146°T at 4.3 kn until 1030, then 252°T at 4.5 kn until 1115.

   Give the 1115 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  

5. At 1340 you fix your position 333°T, 2.4 nm from Mill stack. You steer 269°T at 9.3 kn until 1350, then 343°T at 4.5 kn until 1430.

   Give the 1430 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  

6. At 0835 you fix your position 056°T, 1.6 nm from Gannet Rock daybeacon. You steer 010°T at 7.5 kn until 0900, then 223°T at 5.1 kn until 0940.

   Give the 0940 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 1350 you fix your position 207°T, 1.3 nm from Tern Island tower. You steer 293°T at 7.9 kn until 1425, then 163°T at 8.9 kn until 1505.

   Give the 1505 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  

8. At 1015 you fix your position 286°T, 2.4 nm from Tern Island tower. You steer 346°T at 5.5 kn until 1035, then 217°T at 6.3 kn until 1120.

   Give the 1120 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