This image shows the route, in red, of a typical
sailingcircumnavigation of the world via the
Panama Canal and
Suez Canal, making use of the
trade winds. Shown in yellow is the
antipodean point of each point on the route; it can be seen that a boat following this route will pass through several points antipodean to each other, thus satisfying one definition of a circumnavigation.
This image is in the public domain because it is a screenshot from
NASA’s globe software
World Wind using a public domain layer, such as Blue Marble, MODIS, Landsat, SRTM, USGS or GLOBE.