Worksheet 156 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 037°T, 2.9 nm from Heron Point Light. You steer 134°T at 5.2 kn until 1540, then 334°T at 5.4 kn until 1600.

   Give the 1600 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 1435 you fix your position 074°T, 2.2 nm from Westfield church spire. You steer 027°T at 7.8 kn until 1500, then 175°T at 7.3 kn until 1510.

   Give the 1510 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 0720 you fix your position 040°T, 2.5 nm from Gannet Rock daybeacon. You steer 138°T at 4.8 kn until 0745, then 195°T at 7.4 kn until 0805.

   Give the 0805 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 1310 you fix your position 063°T, 3.2 nm from Heron Point Light. You steer 335°T at 7.4 kn until 1320, then 198°T at 4.3 kn until 1330.

   Give the 1330 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  

5. At 1410 you fix your position 086°T, 1.8 nm from Heron Point Light. You steer 085°T at 7.0 kn until 1440, then 021°T at 8.0 kn until 1455.

   Give the 1455 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  

6. At 1015 you fix your position 217°T, 3.3 nm from Tern Island tower. You steer 255°T at 4.7 kn until 1035, then 037°T at 6.2 kn until 1110.

   Give the 1110 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 1040 you fix your position 074°T, 1.8 nm from Heron Point Light. You steer 039°T at 5.7 kn until 1105, then 349°T at 6.9 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 0815 you fix your position 332°T, 2.2 nm from Tern Island tower. You steer 256°T at 5.1 kn until 0835, then 220°T at 6.4 kn until 0920.

   Give the 0920 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