Worksheet 527 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 051°T, 3.3 nm from Gannet Rock daybeacon. You steer 255°T at 9.2 kn until 1420, then 219°T at 5.2 kn until 1455.

   Give the 1455 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  

2. At 1420 you fix your position 037°T, 3.3 nm from Heron Point Light. You steer 156°T at 5.9 kn until 1455, then 003°T at 5.0 kn until 1515.

   Give the 1515 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  

3. At 1345 you fix your position 031°T, 2.5 nm from Mill stack. You steer 030°T at 6.4 kn until 1355, then 337°T at 4.9 kn until 1410.

   Give the 1410 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  

4. At 0740 you fix your position 303°T, 2.8 nm from Tern Island tower. You steer 263°T at 8.2 kn until 0800, then 066°T at 5.4 kn until 0835.

   Give the 0835 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  

5. At 1325 you fix your position 034°T, 3.2 nm from Westfield church spire. You steer 155°T at 7.7 kn until 1410, then 053°T at 5.6 kn until 1425.

   Give the 1425 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 1550 you fix your position 041°T, 3.3 nm from Westfield church spire. You steer 110°T at 9.1 kn until 1610, then 226°T at 8.1 kn until 1630.

   Give the 1630 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 1410 you fix your position 064°T, 4.2 nm from Tern Island tower. You steer 145°T at 9.5 kn until 1420, then 253°T at 6.7 kn until 1450.

   Give the 1450 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 0705 you fix your position 301°T, 4.0 nm from Tern Island tower. You steer 213°T at 7.6 kn until 0735, then 113°T at 9.1 kn until 0820.

   Give the 0820 DR position as the true bearing FROM Gannet Rock daybeacon 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 Gannet Rock daybeacon: ________ °T   Distance: ________ nm