VeliV said:1st of all, who says that all maps and sea charts are lost? That would basically mean that every library in the Europe would have to be wiped clean, every naval academy destroyed or some sort of other. Man has tried to map the land and sea ever since he found a way to do it, so I highly doubt that all of the knowledge of seamanship would be gone from the surface.
In two hundred years, most of the libraries and the books within would turn to dust, hard drives would de-magnetize and in general, things would've decayed beyong any use.
As I wrote on the wiki, I can understand a single (1) surviving navigational computer with nautical charts, installed in a preserved vessel included in the Valhalla shelter drydock. Not much else.
On top of that, it is probable that even the European commonwealth had some sort of Vaults. Some of these vaults must have contained some information about seamanship (since its very important for the coastal areas).
Between more info on agriculture and seafaring, I'd definitely choose agriculture.
About the ship. Yes, corrosion would kill pretty much any ship that is left into the water, but what about European drydocks? I mean, with the given amount of them that we have here, it quite likely that they were still making ships when the bombs dropped around the world. If Valhallans are fortunate enough, they could just finish up some ship that was never completed before the war.
TWO HUNDRED YEAR VELIV.
TWO HUNDRED YEARS.
Two hundred years of being subjected to the destructive environment with ABSOLUTELY no maintenance. Veliv, why do you think cars in junkyards rust? Why buildings have to be maintained and periodically repaired?
In two hundred years, all drydocks and incomplete vessels would be rusty hulks, devoid of any value. Same goes for any technology they might have, because in two hundred years any would be salvaged.