Worksheet 120 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 054°T, 4.0 nm from Westfield church spire. You steer 197°T at 8.8 kn until 1110, then 342°T at 6.8 kn until 1135.

   Give the 1135 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 1415 you fix your position 072°T, 4.2 nm from Tern Island tower. You steer 227°T at 6.3 kn until 1430, then 003°T at 4.7 kn until 1440.

   Give the 1440 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 1525 you fix your position 237°T, 2.7 nm from Tern Island tower. You steer 226°T at 4.9 kn until 1555, then 332°T at 6.9 kn until 1625.

   Give the 1625 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 1535 you fix your position 035°T, 1.9 nm from Westfield church spire. You steer 065°T at 5.9 kn until 1605, then 248°T at 9.6 kn until 1615.

   Give the 1615 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 0735 you fix your position 243°T, 3.2 nm from Tern Island tower. You steer 240°T at 5.1 kn until 0805, then 357°T at 8.6 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  

6. At 1140 you fix your position 034°T, 2.5 nm from Heron Point Light. You steer 018°T at 5.1 kn until 1225, then 165°T at 5.4 kn until 1305.

   Give the 1305 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 1345 you fix your position 035°T, 4.3 nm from Gannet Rock daybeacon. You steer 340°T at 8.9 kn until 1355, then 263°T at 8.4 kn until 1420.

   Give the 1420 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 1330 you fix your position 247°T, 2.0 nm from Gannet Rock daybeacon. You steer 344°T at 4.3 kn until 1340, then 250°T at 9.9 kn until 1355.

   Give the 1355 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