Worksheet 390 · Skill 3

Dead reckoning

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1. At 1315 you fix your position 307°T, 1.3 nm from Gannet Rock daybeacon. You steer 199°T at 5.3 kn until 1340, then 296°T at 6.5 kn until 1420.

   Give the 1420 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 1245 you fix your position 045°T, 3.4 nm from Tern Island tower. You steer 249°T at 9.3 kn until 1255, then 151°T at 4.7 kn until 1335.

   Give the 1335 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  

3. At 1035 you fix your position 087°T, 2.7 nm from Tern Island tower. You steer 066°T at 8.5 kn until 1045, then 190°T at 9.5 kn until 1120.

   Give the 1120 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  

4. At 1410 you fix your position 256°T, 1.8 nm from Tern Island tower. You steer 261°T at 6.7 kn until 1440, then 333°T at 6.0 kn until 1515.

   Give the 1515 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 021°T, 1.3 nm from Gannet Rock daybeacon. You steer 231°T at 6.1 kn until 1140, then 282°T at 8.8 kn until 1205.

   Give the 1205 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  

6. At 1415 you fix your position 107°T, 2.2 nm from Gannet Rock daybeacon. You steer 235°T at 7.9 kn until 1440, then 282°T at 7.1 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  

7. At 1200 you fix your position 351°T, 1.6 nm from Tern Island tower. You steer 263°T at 9.9 kn until 1215, then 165°T at 6.3 kn until 1250.

   Give the 1250 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 1320 you fix your position 135°T, 2.4 nm from Tern Island tower. You steer 221°T at 5.2 kn until 1355, then 310°T at 8.1 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