I like to provide realistic neutral traffic in scenarios. Maps like the one below indicate (generally) the routes along which worldwide shipping moves. I do *not* know if this map is only ships or if it also includes intercontinental air traffic. But I figure a Great Circle route is a Great Circle route and use the map below to get a general idea of what directions the merchants in my scenarios should be heading.
If anyone has better maps or maps of fishing densities that would be great to!!!
-feld
edit - added uncertainty about air traffic