Worksheet 385 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 314°T, 3.3 nm from Tern Island tower. You steer 250°T at 7.5 kn until 1055, then 140°T at 8.3 kn until 1135.

   Give the 1135 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  

2. At 1440 you fix your position 312°T, 1.7 nm from Tern Island tower. You steer 087°T at 8.9 kn until 1455, then 284°T at 7.9 kn until 1535.

   Give the 1535 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  

3. At 1355 you fix your position 194°T, 1.4 nm from Tern Island tower. You steer 079°T at 4.1 kn until 1440, then 121°T at 9.9 kn until 1450.

   Give the 1450 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 1210 you fix your position 119°T, 1.7 nm from Westfield church spire. You steer 335°T at 5.8 kn until 1240, then 057°T at 7.4 kn until 1250.

   Give the 1250 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 1235 you fix your position 328°T, 2.1 nm from Tern Island tower. You steer 203°T at 7.8 kn until 1310, then 009°T at 5.5 kn until 1325.

   Give the 1325 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 1355 you fix your position 268°T, 2.2 nm from Gannet Rock daybeacon. You steer 271°T at 7.3 kn until 1425, then 043°T at 4.0 kn until 1505.

   Give the 1505 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 1300 you fix your position 210°T, 1.5 nm from Gannet Rock daybeacon. You steer 136°T at 5.4 kn until 1310, then 070°T at 5.6 kn until 1345.

   Give the 1345 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  

8. At 1055 you fix your position 062°T, 3.7 nm from Tern Island tower. You steer 164°T at 5.6 kn until 1125, then 247°T at 5.7 kn until 1200.

   Give the 1200 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