Txurce
Deity
However, I still think you can have a few coastal cities even if you're not going to build a real navy -- what matters is their defensibility. You want as few coastal tiles adjacent to the city as possible, which limits the number of melee ships that can attack per turn; fewer tiles adjacent to those (in the second ring) is also better, since that limits the number of ranged ships that can attack. For a defensible coastal city you just need one melee ship inside it to help attack adjacent ships, your ranged land units and the city can handle the rest.
A coastal city with few water tiles isn't any safer. When attacking these cities, I just rotate my range vessels, then plug the lone water tile with a melee ship.

and
at best scenario possible. And the problem that they belong to such a useless technology, it doesn't have anything else! Moreover you don't need that food so much cause you don't have happiness for that. Don't you think that going for Trade of Military Theory is just better?