Worksheet 55 · Skill 3

Dead reckoning

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1. At 1205 you fix your position 030°T, 2.4 nm from Kittle water tank. You steer 242°T at 4.8 kn until 1235, then 312°T at 7.8 kn until 1315.

   Give the 1315 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 1435 you fix your position 055°T, 3.2 nm from Heron Point Light. You steer 122°T at 7.4 kn until 1510, then 318°T at 9.0 kn until 1535.

   Give the 1535 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 0730 you fix your position 340°T, 1.2 nm from Heron Point Light. You steer 356°T at 5.4 kn until 0745, then 137°T at 6.4 kn until 0815.

   Give the 0815 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  

4. At 0820 you fix your position 340°T, 1.5 nm from Heron Point Light. You steer 052°T at 6.7 kn until 0840, then 100°T at 4.9 kn until 0915.

   Give the 0915 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 1040 you fix your position 043°T, 2.0 nm from Gannet Rock daybeacon. You steer 330°T at 4.7 kn until 1120, then 166°T at 8.7 kn until 1200.

   Give the 1200 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  

6. At 1110 you fix your position 252°T, 2.6 nm from Gannet Rock daybeacon. You steer 078°T at 8.1 kn until 1125, then 217°T at 4.4 kn until 1155.

   Give the 1155 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  

7. At 1415 you fix your position 062°T, 2.7 nm from Tern Island tower. You steer 300°T at 5.4 kn until 1430, then 144°T at 4.6 kn until 1515.

   Give the 1515 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 1600 you fix your position 035°T, 2.8 nm from Westfield church spire. You steer 231°T at 6.2 kn until 1610, then 172°T at 5.1 kn until 1645.

   Give the 1645 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