Source : Webster's Revised Unabridged Dictionary (1913)

Circumnavigation \Cir`cum*nav`i*ga"tion\, n.
   The act of circumnavigating, or sailing round. --Arbuthnot.

Source : WordNet®

circumnavigation
     n : traveling around something (by ship or plane); "Magellan's
         circumnavigation of the earth proved that it is a globe"