Worksheet 175 · Skill 3

Dead reckoning

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1. At 0755 you fix your position 007°T, 2.3 nm from Tern Island tower. You steer 253°T at 9.6 kn until 0830, then 028°T at 5.7 kn until 0840.

   Give the 0840 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  

2. At 0710 you fix your position 054°T, 1.4 nm from Heron Point Light. You steer 287°T at 5.3 kn until 0725, then 114°T at 6.0 kn until 0735.

   Give the 0735 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 0830 you fix your position 072°T, 1.7 nm from Gannet Rock daybeacon. You steer 287°T at 6.0 kn until 0840, then 152°T at 4.5 kn until 0850.

   Give the 0850 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 1510 you fix your position 065°T, 1.8 nm from Heron Point Light. You steer 007°T at 6.2 kn until 1550, then 127°T at 6.9 kn until 1610.

   Give the 1610 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 0845 you fix your position 338°T, 1.6 nm from Kittle water tank. You steer 018°T at 7.3 kn until 0905, then 311°T at 6.7 kn until 0915.

   Give the 0915 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 0750 you fix your position 251°T, 1.5 nm from Tern Island tower. You steer 227°T at 5.8 kn until 0830, then 133°T at 5.5 kn until 0840.

   Give the 0840 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 1330 you fix your position 220°T, 3.1 nm from Tern Island tower. You steer 295°T at 6.2 kn until 1355, then 034°T at 4.0 kn until 1425.

   Give the 1425 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 1155 you fix your position 337°T, 1.2 nm from Heron Point Light. You steer 021°T at 8.9 kn until 1205, then 273°T at 5.8 kn until 1215.

   Give the 1215 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