Worksheet 223 · Skill 3

Dead reckoning

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1. At 0940 you fix your position 082°T, 2.8 nm from Tern Island tower. You steer 021°T at 4.7 kn until 0950, then 148°T at 9.8 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  

2. At 1515 you fix your position 078°T, 2.2 nm from Gannet Rock daybeacon. You steer 353°T at 8.3 kn until 1530, then 239°T at 6.0 kn until 1540.

   Give the 1540 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  

3. At 1125 you fix your position 055°T, 2.2 nm from Gannet Rock daybeacon. You steer 156°T at 6.2 kn until 1140, then 004°T at 5.2 kn until 1220.

   Give the 1220 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 1235 you fix your position 028°T, 1.0 nm from Gannet Rock daybeacon. You steer 117°T at 8.8 kn until 1245, then 223°T at 4.8 kn until 1325.

   Give the 1325 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  

5. At 1305 you fix your position 032°T, 1.5 nm from Heron Point Light. You steer 082°T at 5.3 kn until 1325, then 303°T at 6.6 kn until 1335.

   Give the 1335 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  

6. At 0755 you fix your position 082°T, 2.3 nm from Heron Point Light. You steer 056°T at 6.6 kn until 0840, then 273°T at 5.1 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  

7. At 1450 you fix your position 262°T, 2.1 nm from Gannet Rock daybeacon. You steer 006°T at 6.7 kn until 1500, then 074°T at 6.9 kn until 1540.

   Give the 1540 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 1115 you fix your position 318°T, 2.0 nm from Tern Island tower. You steer 197°T at 7.8 kn until 1155, then 082°T at 5.3 kn until 1225.

   Give the 1225 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