On Thu, 28 Aug 2003, Iain E. Davis wrote: > > How do orca (from that universe) navigate? For that matter, how do orca > from our universe navigate? Triangulation, of course. A shark has an extremely acute sense of smell and can calculate the distance to landmarks (e.g., the site where something died) and common ocean currents or where rivers run into the sea. Recently there are of course ocean-floor cables to follow but those haven't made it to Dragaera yet.