Worksheet 431 · Skill 3

Dead reckoning

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1. At 1510 you fix your position 113°T, 1.4 nm from Westfield church spire. You steer 049°T at 8.2 kn until 1535, then 227°T at 8.7 kn until 1555.

   Give the 1555 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 1255 you fix your position 042°T, 2.4 nm from Heron Point Light. You steer 346°T at 5.5 kn until 1340, then 028°T at 5.8 kn until 1350.

   Give the 1350 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  

3. At 1120 you fix your position 097°T, 2.7 nm from Westfield church spire. You steer 003°T at 8.1 kn until 1135, then 309°T at 6.0 kn until 1205.

   Give the 1205 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 0825 you fix your position 071°T, 1.9 nm from Westfield church spire. You steer 347°T at 4.9 kn until 0845, then 124°T at 4.0 kn until 0915.

   Give the 0915 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 1115 you fix your position 047°T, 2.1 nm from Heron Point Light. You steer 316°T at 4.1 kn until 1145, then 117°T at 7.1 kn until 1215.

   Give the 1215 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  

6. At 1355 you fix your position 135°T, 3.2 nm from Tern Island tower. You steer 340°T at 9.1 kn until 1425, then 234°T at 4.9 kn until 1435.

   Give the 1435 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 0955 you fix your position 349°T, 1.7 nm from Tern Island tower. You steer 274°T at 6.1 kn until 1010, then 229°T at 7.7 kn until 1035.

   Give the 1035 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 1435 you fix your position 045°T, 2.7 nm from Westfield church spire. You steer 222°T at 5.1 kn until 1455, then 024°T at 6.7 kn until 1510.

   Give the 1510 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