Worksheet 277 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 258°T, 2.2 nm from Tern Island tower. You steer 137°T at 7.5 kn until 1300, then 299°T at 7.8 kn until 1345.

   Give the 1345 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 0710 you fix your position 334°T, 2.4 nm from Tern Island tower. You steer 232°T at 4.4 kn until 0745, then 153°T at 5.5 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  

3. At 1415 you fix your position 037°T, 1.5 nm from Kittle water tank. You steer 148°T at 5.1 kn until 1425, then 298°T at 4.3 kn until 1450.

   Give the 1450 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  

4. At 1145 you fix your position 149°T, 2.4 nm from Tern Island tower. You steer 293°T at 6.0 kn until 1210, then 092°T at 4.6 kn until 1235.

   Give the 1235 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 1105 you fix your position 302°T, 2.5 nm from Tern Island tower. You steer 218°T at 9.3 kn until 1125, then 116°T at 6.9 kn until 1135.

   Give the 1135 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 1515 you fix your position 226°T, 3.4 nm from Tern Island tower. You steer 121°T at 8.0 kn until 1540, then 326°T at 4.6 kn until 1610.

   Give the 1610 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 1355 you fix your position 318°T, 3.1 nm from Tern Island tower. You steer 194°T at 9.7 kn until 1420, then 133°T at 9.5 kn until 1450.

   Give the 1450 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  

8. At 1400 you fix your position 046°T, 2.8 nm from Gannet Rock daybeacon. You steer 289°T at 9.2 kn until 1415, then 042°T at 4.3 kn until 1455.

   Give the 1455 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