In contrast, what we know from facts about sea travel: even real land monsters might leave you alone once in a while but the sea is actively trying to kill you at every moment. There are real problems to be solved, like fresh water generation, bad weather and having enough food supplies to last until landfall. The monsters out there are quite real and quite deadly.
Did you know that the sea is still deadly? Not all of these are fatalities, but some are: https://en.wikipedia.org/wiki/List_of_shipwrecks_in_2018