>>96118801 (OP)Mostly limited to coastal seafaring, with fluvial navigation being the most active.
the reason is simple; the high seas are choking full of sea monsters, even undead ones, so high sea exploration and charting is nigh impossible. It's just too resource demanding and a high risk enterprise, and even if some of the most powerful and rich political entities do launch marine expeditions from time to time (to find islands near their shores or to locate ancient lost cities rumored to have existed in the past and isolated from the mainland due to different cataclysms and magic fuckeries that took place in the past), so far none have succeeded, and so the seas remain mostly unexplored. Seafarers limit their activities to the coasts due to trade and fishing still being vital activities for the prosperity of nations, but they must always keep land in sight, and rarely go further than two or three miles into open water.
The only exception are the pirate followers of the shark god of storms and shipwrecks, who freely sail the seas safe from the constant assaults of monsters, but are sometimes actively aided in their raids by krakens, sea serpents and other oceanic horrors.
A few great minds with the insight, ingenuity and resources to research an alternative to sea travel are trying to develop flying craft similar to zepelins and hot air balloons in order to cross over the ocean rather than through it, but with limited succeed so far