Worksheet 192 · Skill 3

Dead reckoning

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1. At 1245 you fix your position 315°T, 3.4 nm from Tern Island tower. You steer 177°T at 5.8 kn until 1315, then 217°T at 9.0 kn until 1325.

   Give the 1325 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 1055 you fix your position 016°T, 2.9 nm from Mill stack. You steer 214°T at 5.6 kn until 1110, then 002°T at 4.3 kn until 1150.

   Give the 1150 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 1335 you fix your position 047°T, 2.1 nm from Kittle water tank. You steer 359°T at 8.8 kn until 1355, then 241°T at 5.2 kn until 1415.

   Give the 1415 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 0900 you fix your position 027°T, 1.5 nm from Heron Point Light. You steer 155°T at 7.1 kn until 0915, then 080°T at 8.8 kn until 1000.

   Give the 1000 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 0910 you fix your position 195°T, 1.4 nm from Tern Island tower. You steer 210°T at 6.4 kn until 0935, then 054°T at 9.6 kn until 0950.

   Give the 0950 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 1010 you fix your position 045°T, 2.6 nm from Westfield church spire. You steer 155°T at 4.4 kn until 1055, then 060°T at 4.9 kn until 1130.

   Give the 1130 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 0700 you fix your position 189°T, 1.3 nm from Tern Island tower. You steer 209°T at 5.0 kn until 0715, then 070°T at 9.1 kn until 0755.

   Give the 0755 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 1000 you fix your position 192°T, 1.8 nm from Tern Island tower. You steer 191°T at 6.4 kn until 1010, then 056°T at 5.3 kn until 1050.

   Give the 1050 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