As I was sailing around with everyone's favourite pirate, while looking for certain expensive beetle, I came up with idea - crow's nest. Seriously, they were on ships for a reason.. They would be on galleons (big ships I mean), and if someone used them, they'd get radar of sort, gump that tells them where is nearest ship in square area of.. let's say, 5 screens. Since all those sailors, fishermen and pirates were waiting for High Seas update and now there still isn't much traffic on seas, this would help it.