Worksheet 218 · Skill 3

Dead reckoning

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1. At 1550 you fix your position 043°T, 1.6 nm from Kittle water tank. You steer 272°T at 9.3 kn until 1630, then 005°T at 8.5 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  

2. At 0725 you fix your position 042°T, 2.8 nm from Gannet Rock daybeacon. You steer 150°T at 4.6 kn until 0800, then 283°T at 9.2 kn until 0815.

   Give the 0815 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  

3. At 1225 you fix your position 012°T, 2.8 nm from Mill stack. You steer 345°T at 8.0 kn until 1255, then 172°T at 6.7 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  

4. At 1310 you fix your position 089°T, 1.6 nm from Gannet Rock daybeacon. You steer 232°T at 6.8 kn until 1340, then 272°T at 4.0 kn until 1355.

   Give the 1355 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

5. At 0725 you fix your position 221°T, 3.2 nm from Tern Island tower. You steer 352°T at 5.7 kn until 0805, then 197°T at 9.9 kn until 0820.

   Give the 0820 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 1250 you fix your position 078°T, 2.0 nm from Tern Island tower. You steer 341°T at 9.4 kn until 1300, then 271°T at 5.9 kn until 1335.

   Give the 1335 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 1340 you fix your position 063°T, 3.7 nm from Westfield church spire. You steer 113°T at 4.0 kn until 1350, then 074°T at 8.3 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  

8. At 0810 you fix your position 284°T, 1.9 nm from Gannet Rock daybeacon. You steer 314°T at 5.5 kn until 0830, then 347°T at 6.6 kn until 0845.

   Give the 0845 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