Worksheet 579 · Skill 3

Dead reckoning

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1. At 0810 you fix your position 265°T, 2.8 nm from Tern Island tower. You steer 311°T at 4.3 kn until 0840, then 024°T at 4.5 kn until 0850.

   Give the 0850 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 1300 you fix your position 061°T, 1.6 nm from Westfield church spire. You steer 296°T at 6.3 kn until 1310, then 030°T at 6.9 kn until 1320.

   Give the 1320 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 1250 you fix your position 245°T, 1.4 nm from Gannet Rock daybeacon. You steer 130°T at 9.5 kn until 1300, then 275°T at 6.7 kn until 1315.

   Give the 1315 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 0815 you fix your position 215°T, 2.5 nm from Tern Island tower. You steer 085°T at 6.4 kn until 0855, then 262°T at 6.6 kn until 0940.

   Give the 0940 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 1410 you fix your position 062°T, 2.4 nm from Gannet Rock daybeacon. You steer 194°T at 5.6 kn until 1435, then 340°T at 6.2 kn until 1505.

   Give the 1505 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  

6. At 1130 you fix your position 053°T, 3.7 nm from Westfield church spire. You steer 179°T at 6.1 kn until 1200, then 051°T at 6.2 kn until 1220.

   Give the 1220 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 1320 you fix your position 224°T, 2.2 nm from Gannet Rock daybeacon. You steer 321°T at 7.6 kn until 1400, then 258°T at 4.9 kn until 1420.

   Give the 1420 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  

8. At 1445 you fix your position 199°T, 2.4 nm from Tern Island tower. You steer 280°T at 8.0 kn until 1515, then 326°T at 4.7 kn until 1540.

   Give the 1540 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