I think there needs to be a chance of permadeath, simply to deter suicide for advantage that so many have mentioned. In my comments on the subject, I've always mentioned the risk of permadeath, because I never saw it as a certainty from the subject's point of view.
The limitation on information transfer to the rest of the community is also a powerful deterrent to abuse. It simply doesn't matter to have discovered another continent if there is no way of determining exactly where you are. The discovery credit should only go to those who report it to the general community using entirely in-game means. Discord communication will exist, but will merely serve to register the existence of habitable (or maybe not so habitable) land somewhere in the general vicinity. Unless the character so marooned has substantial cartography and navigation skills, and is able to tell time with chronometric accuracy without benefit of said instrument, he will have no idea where he is within the rough boundaries of, say, a duchy.
This brings up a side issue that I've been mulling for a while. Will the horizon on Elyria be proportional to the sized of the Elyrian world, or will it by artifice or fudge be similar to what it is on earth? If it is proportional, actually sighting land at any distance will be rather difficult. Seasoned seafarers might be able to detect land over the horizon by presence of cloud formations, types of birds nearby, etc., but landlubbers should mostly be totally clueless.
P.S., don't forget about krakens!