Worksheet 689 · Skill 3

Dead reckoning

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1. At 0945 you fix your position 080°T, 3.5 nm from Westfield church spire. You steer 050°T at 7.3 kn until 1015, then 200°T at 9.2 kn until 1050.

   Give the 1050 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 0930 you fix your position 067°T, 3.1 nm from Westfield church spire. You steer 067°T at 8.4 kn until 1015, then 176°T at 9.0 kn until 1035.

   Give the 1035 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 1015 you fix your position 069°T, 3.6 nm from Westfield church spire. You steer 182°T at 4.2 kn until 1035, then 231°T at 4.0 kn until 1045.

   Give the 1045 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  

4. At 1255 you fix your position 238°T, 2.9 nm from Tern Island tower. You steer 207°T at 8.7 kn until 1315, then 137°T at 5.2 kn until 1335.

   Give the 1335 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  

5. At 1355 you fix your position 082°T, 2.5 nm from Westfield church spire. You steer 056°T at 8.6 kn until 1430, then 269°T at 6.2 kn until 1500.

   Give the 1500 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 0940 you fix your position 029°T, 2.0 nm from Mill stack. You steer 072°T at 5.4 kn until 1025, then 273°T at 6.0 kn until 1110.

   Give the 1110 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  

7. At 0910 you fix your position 041°T, 2.5 nm from Westfield church spire. You steer 085°T at 6.9 kn until 0920, then 042°T at 6.6 kn until 0930.

   Give the 0930 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 0725 you fix your position 013°T, 3.0 nm from Mill stack. You steer 292°T at 4.4 kn until 0740, then 007°T at 9.8 kn until 0755.

   Give the 0755 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