Worksheet 375 · Skill 3

Dead reckoning

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1. At 0730 you fix your position 002°T, 2.9 nm from Mill stack. You steer 337°T at 7.1 kn until 0805, then 252°T at 7.7 kn until 0815.

   Give the 0815 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 1125 you fix your position 299°T, 3.0 nm from Tern Island tower. You steer 282°T at 6.6 kn until 1200, then 199°T at 6.8 kn until 1220.

   Give the 1220 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 1445 you fix your position 292°T, 2.7 nm from Tern Island tower. You steer 191°T at 9.3 kn until 1510, then 235°T at 7.2 kn until 1525.

   Give the 1525 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  

4. At 1515 you fix your position 041°T, 3.7 nm from Westfield church spire. You steer 201°T at 6.6 kn until 1540, then 129°T at 8.2 kn until 1550.

   Give the 1550 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 1355 you fix your position 022°T, 2.8 nm from Heron Point Light. You steer 146°T at 4.6 kn until 1420, then 109°T at 8.3 kn until 1435.

   Give the 1435 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 0800 you fix your position 060°T, 3.4 nm from Westfield church spire. You steer 122°T at 9.5 kn until 0810, then 279°T at 6.2 kn until 0835.

   Give the 0835 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 1400 you fix your position 162°T, 1.2 nm from Tern Island tower. You steer 225°T at 7.6 kn until 1415, then 112°T at 8.4 kn until 1500.

   Give the 1500 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  

8. At 0930 you fix your position 062°T, 3.9 nm from Westfield church spire. You steer 306°T at 4.8 kn until 0955, then 094°T at 10.0 kn until 1040.

   Give the 1040 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