Worksheet 255 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 253°T, 2.7 nm from Tern Island tower. You steer 217°T at 5.0 kn until 1415, then 251°T at 6.8 kn until 1435.

   Give the 1435 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 1230 you fix your position 100°T, 2.1 nm from Westfield church spire. You steer 335°T at 5.9 kn until 1255, then 107°T at 8.6 kn until 1335.

   Give the 1335 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 1010 you fix your position 005°T, 2.6 nm from Mill stack. You steer 311°T at 5.0 kn until 1030, then 113°T at 6.2 kn until 1055.

   Give the 1055 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 0940 you fix your position 011°T, 1.9 nm from Westfield church spire. You steer 065°T at 5.2 kn until 1005, then 137°T at 7.9 kn until 1045.

   Give the 1045 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  

5. At 1125 you fix your position 056°T, 0.9 nm from Gannet Rock daybeacon. You steer 100°T at 7.8 kn until 1135, then 282°T at 4.8 kn until 1150.

   Give the 1150 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  

6. At 1050 you fix your position 016°T, 1.5 nm from Heron Point Light. You steer 053°T at 8.3 kn until 1120, then 281°T at 6.6 kn until 1155.

   Give the 1155 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  

7. At 0840 you fix your position 032°T, 4.2 nm from Westfield church spire. You steer 121°T at 6.8 kn until 0855, then 307°T at 5.2 kn until 0905.

   Give the 0905 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  

8. At 1225 you fix your position 325°T, 1.1 nm from Kittle water tank. You steer 293°T at 8.2 kn until 1240, then 261°T at 5.9 kn until 1305.

   Give the 1305 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