Worksheet 47 · Skill 3

Dead reckoning

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1. At 1455 you fix your position 020°T, 2.6 nm from Heron Point Light. You steer 267°T at 6.0 kn until 1510, then 014°T at 5.6 kn until 1535.

   Give the 1535 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 1035 you fix your position 127°T, 1.7 nm from Gannet Rock daybeacon. You steer 244°T at 9.7 kn until 1100, then 007°T at 8.3 kn until 1130.

   Give the 1130 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 1325 you fix your position 017°T, 2.5 nm from Westfield church spire. You steer 099°T at 7.3 kn until 1350, then 162°T at 6.7 kn until 1430.

   Give the 1430 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  

4. At 0740 you fix your position 137°T, 2.6 nm from Tern Island tower. You steer 098°T at 4.7 kn until 0810, then 219°T at 5.8 kn until 0835.

   Give the 0835 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  

5. At 0955 you fix your position 013°T, 3.1 nm from Westfield church spire. You steer 159°T at 5.6 kn until 1030, then 057°T at 7.0 kn until 1050.

   Give the 1050 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 0800 you fix your position 264°T, 0.9 nm from Gannet Rock daybeacon. You steer 290°T at 8.6 kn until 0830, then 014°T at 8.5 kn until 0840.

   Give the 0840 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  

7. At 0720 you fix your position 353°T, 2.6 nm from Mill stack. You steer 083°T at 4.8 kn until 0730, then 231°T at 5.5 kn until 0745.

   Give the 0745 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 0725 you fix your position 036°T, 1.9 nm from Gannet Rock daybeacon. You steer 251°T at 8.3 kn until 0805, then 336°T at 8.6 kn until 0820.

   Give the 0820 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