Worksheet 601 · Skill 3

Dead reckoning

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1. At 0900 you fix your position 050°T, 3.0 nm from Heron Point Light. You steer 292°T at 9.5 kn until 0915, then 117°T at 7.7 kn until 0925.

   Give the 0925 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 0935 you fix your position 282°T, 1.9 nm from Gannet Rock daybeacon. You steer 079°T at 9.2 kn until 0955, then 252°T at 5.9 kn until 1005.

   Give the 1005 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 1100 you fix your position 261°T, 2.3 nm from Tern Island tower. You steer 148°T at 9.9 kn until 1130, then 035°T at 4.0 kn until 1155.

   Give the 1155 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 0720 you fix your position 352°T, 1.4 nm from Kittle water tank. You steer 295°T at 4.0 kn until 0730, then 052°T at 4.3 kn until 0740.

   Give the 0740 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 1505 you fix your position 112°T, 1.7 nm from Westfield church spire. You steer 230°T at 4.7 kn until 1520, then 070°T at 8.0 kn until 1540.

   Give the 1540 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  

6. At 1235 you fix your position 049°T, 1.4 nm from Westfield church spire. You steer 092°T at 7.8 kn until 1305, then 352°T at 6.3 kn until 1320.

   Give the 1320 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 1145 you fix your position 040°T, 1.5 nm from Tern Island tower. You steer 156°T at 8.1 kn until 1210, then 329°T at 6.9 kn until 1220.

   Give the 1220 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 1045 you fix your position 018°T, 3.5 nm from Westfield church spire. You steer 141°T at 8.2 kn until 1110, then 079°T at 5.0 kn until 1140.

   Give the 1140 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