Worksheet 42 · Skill 3

Dead reckoning

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1. At 1335 you fix your position 171°T, 1.4 nm from Gannet Rock daybeacon. You steer 301°T at 7.9 kn until 1345, then 139°T at 4.5 kn until 1410.

   Give the 1410 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

2. At 1315 you fix your position 288°T, 1.7 nm from Tern Island tower. You steer 231°T at 4.0 kn until 1325, then 299°T at 4.0 kn until 1350.

   Give the 1350 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 0705 you fix your position 038°T, 4.5 nm from Westfield church spire. You steer 128°T at 9.0 kn until 0725, then 253°T at 5.6 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  

4. At 1245 you fix your position 286°T, 1.4 nm from Tern Island tower. You steer 018°T at 8.4 kn until 1300, then 216°T at 6.7 kn until 1310.

   Give the 1310 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 1350 you fix your position 135°T, 3.3 nm from Tern Island tower. You steer 340°T at 5.8 kn until 1430, then 261°T at 4.1 kn until 1515.

   Give the 1515 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 0725 you fix your position 066°T, 2.7 nm from Tern Island tower. You steer 214°T at 5.6 kn until 0735, then 112°T at 7.3 kn until 0755.

   Give the 0755 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 0725 you fix your position 296°T, 4.3 nm from Tern Island tower. You steer 242°T at 5.4 kn until 0805, then 359°T at 5.7 kn until 0820.

   Give the 0820 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 1215 you fix your position 038°T, 2.6 nm from Tern Island tower. You steer 079°T at 8.0 kn until 1235, then 245°T at 8.9 kn until 1255.

   Give the 1255 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