Worksheet 479 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 062°T, 3.3 nm from Westfield church spire. You steer 161°T at 6.5 kn until 0825, then 231°T at 5.5 kn until 0835.

   Give the 0835 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 1600 you fix your position 226°T, 3.4 nm from Tern Island tower. You steer 109°T at 5.5 kn until 1635, then 287°T at 8.2 kn until 1710.

   Give the 1710 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  

3. At 1130 you fix your position 032°T, 2.8 nm from Tern Island tower. You steer 118°T at 8.7 kn until 1140, then 161°T at 5.9 kn until 1215.

   Give the 1215 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 1005 you fix your position 302°T, 4.0 nm from Tern Island tower. You steer 280°T at 8.2 kn until 1025, then 115°T at 9.3 kn until 1055.

   Give the 1055 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 1115 you fix your position 069°T, 2.4 nm from Westfield church spire. You steer 152°T at 7.6 kn until 1145, then 026°T at 5.8 kn until 1225.

   Give the 1225 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 1305 you fix your position 036°T, 2.4 nm from Mill stack. You steer 145°T at 7.3 kn until 1315, then 280°T at 10.0 kn until 1340.

   Give the 1340 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 1400 you fix your position 244°T, 2.1 nm from Gannet Rock daybeacon. You steer 311°T at 8.5 kn until 1440, then 076°T at 5.5 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  

8. At 0750 you fix your position 321°T, 1.2 nm from Kittle water tank. You steer 084°T at 9.1 kn until 0805, then 000°T at 8.1 kn until 0850.

   Give the 0850 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