Worksheet 215 · Skill 3

Dead reckoning

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1. At 0745 you fix your position 084°T, 1.6 nm from Westfield church spire. You steer 298°T at 7.9 kn until 0755, then 109°T at 5.9 kn until 0810.

   Give the 0810 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 1320 you fix your position 010°T, 2.4 nm from Westfield church spire. You steer 088°T at 7.7 kn until 1350, then 299°T at 5.4 kn until 1415.

   Give the 1415 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 1110 you fix your position 014°T, 3.7 nm from Westfield church spire. You steer 172°T at 9.5 kn until 1140, then 009°T at 5.6 kn until 1210.

   Give the 1210 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 0940 you fix your position 059°T, 3.5 nm from Tern Island tower. You steer 235°T at 5.1 kn until 0950, then 154°T at 7.9 kn until 1005.

   Give the 1005 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  

5. At 1515 you fix your position 229°T, 2.0 nm from Gannet Rock daybeacon. You steer 234°T at 4.0 kn until 1550, then 335°T at 8.4 kn until 1620.

   Give the 1620 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  

6. At 1335 you fix your position 210°T, 2.4 nm from Gannet Rock daybeacon. You steer 283°T at 6.0 kn until 1355, then 091°T at 7.3 kn until 1420.

   Give the 1420 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  

7. At 1510 you fix your position 033°T, 1.9 nm from Gannet Rock daybeacon. You steer 016°T at 7.4 kn until 1525, then 233°T at 4.4 kn until 1600.

   Give the 1600 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 0830 you fix your position 028°T, 2.0 nm from Kittle water tank. You steer 284°T at 4.2 kn until 0840, then 053°T at 6.4 kn until 0850.

   Give the 0850 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