Worksheet 589 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 351°T, 3.0 nm from Mill stack. You steer 148°T at 4.9 kn until 1050, then 290°T at 7.4 kn until 1130.

   Give the 1130 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  

2. At 1355 you fix your position 294°T, 2.0 nm from Kittle water tank. You steer 030°T at 5.0 kn until 1425, then 355°T at 9.8 kn until 1450.

   Give the 1450 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 1210 you fix your position 342°T, 1.2 nm from Gannet Rock daybeacon. You steer 111°T at 4.3 kn until 1225, then 296°T at 6.8 kn until 1235.

   Give the 1235 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 1215 you fix your position 098°T, 2.6 nm from Westfield church spire. You steer 002°T at 5.4 kn until 1235, then 133°T at 5.1 kn until 1305.

   Give the 1305 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 0715 you fix your position 076°T, 2.5 nm from Heron Point Light. You steer 280°T at 4.6 kn until 0730, then 006°T at 10.0 kn until 0755.

   Give the 0755 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 1245 you fix your position 047°T, 2.3 nm from Gannet Rock daybeacon. You steer 332°T at 6.2 kn until 1300, then 290°T at 4.7 kn until 1345.

   Give the 1345 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 0920 you fix your position 088°T, 3.5 nm from Westfield church spire. You steer 081°T at 4.4 kn until 0945, then 136°T at 6.6 kn until 1005.

   Give the 1005 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 1435 you fix your position 106°T, 1.0 nm from Westfield church spire. You steer 094°T at 9.6 kn until 1510, then 179°T at 6.4 kn until 1535.

   Give the 1535 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