Worksheet 643 · Skill 3

Dead reckoning

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1. At 1150 you fix your position 209°T, 1.9 nm from Gannet Rock daybeacon. You steer 145°T at 4.3 kn until 1200, then 298°T at 6.7 kn until 1245.

   Give the 1245 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 1230 you fix your position 255°T, 1.7 nm from Gannet Rock daybeacon. You steer 358°T at 8.5 kn until 1240, then 070°T at 4.9 kn until 1250.

   Give the 1250 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 1235 you fix your position 034°T, 2.2 nm from Westfield church spire. You steer 023°T at 7.6 kn until 1245, then 197°T at 6.8 kn until 1305.

   Give the 1305 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  

4. At 1220 you fix your position 035°T, 2.5 nm from Kittle water tank. You steer 332°T at 6.8 kn until 1245, then 200°T at 7.8 kn until 1255.

   Give the 1255 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 1405 you fix your position 054°T, 1.9 nm from Heron Point Light. You steer 057°T at 7.9 kn until 1435, then 289°T at 4.0 kn until 1520.

   Give the 1520 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 1410 you fix your position 072°T, 2.8 nm from Gannet Rock daybeacon. You steer 269°T at 6.8 kn until 1425, then 339°T at 7.1 kn until 1450.

   Give the 1450 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 1115 you fix your position 050°T, 2.0 nm from Heron Point Light. You steer 304°T at 4.2 kn until 1140, then 033°T at 4.6 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  

8. At 0910 you fix your position 042°T, 1.5 nm from Westfield church spire. You steer 068°T at 6.9 kn until 0920, then 108°T at 4.3 kn until 1000.

   Give the 1000 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