Worksheet 639 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 038°T, 2.9 nm from Tern Island tower. You steer 124°T at 6.4 kn until 1240, then 041°T at 4.7 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  

2. At 1030 you fix your position 028°T, 3.0 nm from Gannet Rock daybeacon. You steer 221°T at 9.4 kn until 1100, then 111°T at 5.3 kn until 1135.

   Give the 1135 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  

3. At 0945 you fix your position 067°T, 2.7 nm from Gannet Rock daybeacon. You steer 302°T at 7.6 kn until 1005, then 158°T at 8.8 kn until 1040.

   Give the 1040 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 1355 you fix your position 076°T, 2.1 nm from Gannet Rock daybeacon. You steer 025°T at 4.4 kn until 1415, then 199°T at 8.7 kn until 1445.

   Give the 1445 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  

5. At 1355 you fix your position 291°T, 2.9 nm from Tern Island tower. You steer 300°T at 7.6 kn until 1405, then 236°T at 6.8 kn until 1415.

   Give the 1415 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  

6. At 0910 you fix your position 288°T, 3.5 nm from Tern Island tower. You steer 191°T at 8.2 kn until 0945, then 294°T at 4.5 kn until 1020.

   Give the 1020 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  

7. At 1050 you fix your position 217°T, 2.3 nm from Tern Island tower. You steer 257°T at 5.1 kn until 1110, then 084°T at 5.8 kn until 1125.

   Give the 1125 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 0950 you fix your position 035°T, 1.8 nm from Tern Island tower. You steer 125°T at 6.5 kn until 1015, then 224°T at 4.2 kn until 1050.

   Give the 1050 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