Worksheet 12 · Skill 3

Dead reckoning

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1. At 0720 you fix your position 058°T, 2.9 nm from Westfield church spire. You steer 298°T at 4.5 kn until 0755, then 051°T at 5.1 kn until 0805.

   Give the 0805 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 1250 you fix your position 023°T, 2.5 nm from Mill stack. You steer 078°T at 6.7 kn until 1330, then 339°T at 7.1 kn until 1415.

   Give the 1415 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 0735 you fix your position 033°T, 4.2 nm from Westfield church spire. You steer 105°T at 9.1 kn until 0815, then 006°T at 6.0 kn until 0825.

   Give the 0825 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  

4. At 1220 you fix your position 287°T, 0.9 nm from Gannet Rock daybeacon. You steer 020°T at 4.5 kn until 1305, then 320°T at 8.4 kn until 1320.

   Give the 1320 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 1145 you fix your position 126°T, 0.9 nm from Gannet Rock daybeacon. You steer 057°T at 4.7 kn until 1215, then 186°T at 7.3 kn until 1240.

   Give the 1240 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  

6. At 1600 you fix your position 061°T, 1.1 nm from Westfield church spire. You steer 080°T at 5.4 kn until 1645, then 217°T at 8.2 kn until 1655.

   Give the 1655 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 052°T, 2.7 nm from Westfield church spire. You steer 343°T at 9.1 kn until 1330, then 119°T at 7.0 kn until 1410.

   Give the 1410 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 1215 you fix your position 263°T, 1.7 nm from Tern Island tower. You steer 036°T at 4.7 kn until 1245, then 214°T at 4.4 kn until 1315.

   Give the 1315 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