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 Tiger9gamer wrote:
Why is an aircradt carrier obsolete? it seems like a very safe way to launch fighter support when the enemy would have to swim to get to you.

Aircraft Carriers aren't obsolete. The Mars Class Battlecruiser is known for being an excellent aircraft carrier.

I'm sure there's a short piece of fluff about a ship at sea during a Tyranid invasion. The crewman witnesses spores hitting the ocean and reports strange noises against the hull.

Perhaps fishing vessels and transport ships still exist to cart stuff around worlds. Given the various technological stages within the IoM I can see this as a possibility.

Oh, definitely. As a platform for trade and travel on water-bearing worlds, or as a tool for the PDF of a planet to get round by, they make perfect sense.

What they don't make sense for is for the mobile IG to have as a permanent part of their issue, as there is no way to guarantee the next world they go to won't be a desert world or some frozen iceball or something.

I can quite easily see large vessels been used for orbital defence lasers and silos being ship based. Along with some void shielding.

Many planets in the Imperium are essentially unrelated to the Imperium at large. As long as they're not too heretical (at least, as long as nobody notices it) and they pay their tithe, they can operate in any way. There's no reason why there wouldn't be worlds that have their own armies and fight their own wars much as we do on modern-day Earth, in which a navy would have its obvious uses, and of course there are the feudal worlds and the like that have no knowledge of the Imperium or what lies beyond their world. Even Ork worlds would probably make heavy use of naval assets to wage their planet-wide wars.

But yes, of course every civilisation would have sea vessels for purposes of trade and so on, at the very least. Also, I really hate the terms like "ocean world" and "desert world". Planet of Hats is just silly!

Well, a world that is entirely liquid, and has cities that float on giant, artificial constructions really doesn't have much of a better term. It's a classification for worlds that are mono-environment, or at least majority-environment. If 95% of your planet is desert, why not call it a Desert World?