Worksheet 711 · Skill 3

Dead reckoning

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1. At 1120 you fix your position 091°T, 2.5 nm from Westfield church spire. You steer 236°T at 5.8 kn until 1135, then 065°T at 4.5 kn until 1210.

   Give the 1210 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 1110 you fix your position 246°T, 3.2 nm from Tern Island tower. You steer 151°T at 6.2 kn until 1125, then 203°T at 6.7 kn until 1135.

   Give the 1135 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  

3. At 1215 you fix your position 023°T, 2.5 nm from Mill stack. You steer 089°T at 5.5 kn until 1250, then 224°T at 5.5 kn until 1300.

   Give the 1300 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 1325 you fix your position 105°T, 1.6 nm from Westfield church spire. You steer 015°T at 9.1 kn until 1340, then 163°T at 7.5 kn until 1400.

   Give the 1400 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 0955 you fix your position 264°T, 2.8 nm from Tern Island tower. You steer 275°T at 7.2 kn until 1030, then 067°T at 9.3 kn until 1055.

   Give the 1055 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 1455 you fix your position 072°T, 1.5 nm from Gannet Rock daybeacon. You steer 001°T at 6.6 kn until 1505, then 056°T at 10.0 kn until 1515.

   Give the 1515 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 1340 you fix your position 329°T, 1.3 nm from Heron Point Light. You steer 110°T at 6.7 kn until 1350, then 078°T at 8.6 kn until 1425.

   Give the 1425 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  

8. At 0715 you fix your position 050°T, 2.9 nm from Westfield church spire. You steer 203°T at 5.2 kn until 0740, then 104°T at 6.0 kn until 0810.

   Give the 0810 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