Worksheet 702 · Skill 3

Dead reckoning

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1. At 0935 you fix your position 301°T, 4.7 nm from Tern Island tower. You steer 207°T at 4.9 kn until 1015, then 110°T at 9.7 kn until 1055.

   Give the 1055 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  

2. At 1445 you fix your position 053°T, 2.3 nm from Westfield church spire. You steer 151°T at 4.8 kn until 1515, then 335°T at 6.9 kn until 1555.

   Give the 1555 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 1040 you fix your position 013°T, 1.6 nm from Mill stack. You steer 025°T at 5.2 kn until 1100, then 208°T at 5.3 kn until 1110.

   Give the 1110 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  

4. At 0805 you fix your position 039°T, 2.8 nm from Tern Island tower. You steer 262°T at 4.5 kn until 0830, then 088°T at 7.1 kn until 0840.

   Give the 0840 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 1200 you fix your position 093°T, 3.0 nm from Westfield church spire. You steer 333°T at 7.0 kn until 1235, then 235°T at 4.9 kn until 1245.

   Give the 1245 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 1350 you fix your position 257°T, 3.4 nm from Tern Island tower. You steer 170°T at 8.9 kn until 1410, then 210°T at 4.1 kn until 1425.

   Give the 1425 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

7. At 0715 you fix your position 094°T, 2.1 nm from Gannet Rock daybeacon. You steer 009°T at 8.9 kn until 0735, then 154°T at 9.3 kn until 0745.

   Give the 0745 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  

8. At 1200 you fix your position 053°T, 3.6 nm from Gannet Rock daybeacon. You steer 192°T at 8.6 kn until 1220, then 283°T at 6.9 kn until 1235.

   Give the 1235 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