Worksheet 610 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 186°T, 1.8 nm from Gannet Rock daybeacon. You steer 097°T at 7.6 kn until 1415, then 274°T at 5.1 kn until 1445.

   Give the 1445 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  

2. At 1125 you fix your position 155°T, 1.4 nm from Westfield church spire. You steer 052°T at 7.4 kn until 1205, then 012°T at 9.8 kn until 1215.

   Give the 1215 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 0730 you fix your position 326°T, 3.0 nm from Kittle water tank. You steer 129°T at 7.9 kn until 0740, then 295°T at 5.1 kn until 0810.

   Give the 0810 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 1355 you fix your position 291°T, 2.1 nm from Tern Island tower. You steer 324°T at 4.3 kn until 1420, then 222°T at 6.5 kn until 1450.

   Give the 1450 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 1150 you fix your position 219°T, 1.7 nm from Gannet Rock daybeacon. You steer 090°T at 5.7 kn until 1220, then 333°T at 6.7 kn until 1250.

   Give the 1250 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 1355 you fix your position 260°T, 3.4 nm from Tern Island tower. You steer 305°T at 7.6 kn until 1405, then 269°T at 5.6 kn until 1435.

   Give the 1435 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 1500 you fix your position 345°T, 2.6 nm from Tern Island tower. You steer 096°T at 9.2 kn until 1535, then 230°T at 6.0 kn until 1555.

   Give the 1555 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 0900 you fix your position 062°T, 2.8 nm from Tern Island tower. You steer 093°T at 4.5 kn until 0910, then 262°T at 4.2 kn until 0925.

   Give the 0925 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