I've heard of the" White Shark Cafe' " and I find it interesting how white sharks, and most other migratory marine species for that matter, travel great distances on such precise routes year after year.
i'm not a marine biologist or researcher or any kind, but I would venture a guess that they would use their acute senses to find their way, but perhaps there is a learned aspect and they simply know the route like we know the route to work every day.
perhaps when more funding is invested in research as opposed to sweaters and fashions for dogs, maybe we will learn more about these incredible creatures who share their seas with us.