Worksheet 172 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 262°T, 0.8 nm from Gannet Rock daybeacon. You steer 049°T at 7.4 kn until 0835, then 174°T at 8.5 kn until 0910.

   Give the 0910 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  

2. At 0800 you fix your position 351°T, 2.1 nm from Mill stack. You steer 349°T at 6.9 kn until 0820, then 088°T at 5.2 kn until 0845.

   Give the 0845 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 0830 you fix your position 074°T, 2.4 nm from Gannet Rock daybeacon. You steer 342°T at 8.4 kn until 0850, then 227°T at 4.7 kn until 0910.

   Give the 0910 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  

4. At 1535 you fix your position 029°T, 2.2 nm from Westfield church spire. You steer 131°T at 5.8 kn until 1545, then 162°T at 7.2 kn until 1615.

   Give the 1615 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 1600 you fix your position 040°T, 3.2 nm from Heron Point Light. You steer 024°T at 7.1 kn until 1625, then 261°T at 5.1 kn until 1640.

   Give the 1640 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 1110 you fix your position 021°T, 2.6 nm from Heron Point Light. You steer 108°T at 5.6 kn until 1145, then 258°T at 5.8 kn until 1220.

   Give the 1220 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 1430 you fix your position 079°T, 2.2 nm from Westfield church spire. You steer 051°T at 5.8 kn until 1510, then 209°T at 5.3 kn until 1550.

   Give the 1550 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  

8. At 0720 you fix your position 044°T, 2.4 nm from Westfield church spire. You steer 229°T at 9.1 kn until 0730, then 115°T at 7.3 kn until 0750.

   Give the 0750 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