Anti-ship batteries fire on ships. Place on a lake shore or the planet rim. Range, levels, and Repairman.
If it is a hull, it is in range. The battery does not care if the water is a lake or the black between worlds.
Place on owned land at a lake shore or the planet edge. Shells enemy ships. Upgrade to level 10. Range grows from 80 toward 113 tiles. Repairman starts healing at level 4. Volley size steps up with level. About 8 seconds to build. Cost scales, cap $400,000.
Back to the building list or pick a map like Sol System and play Claiming Cosmos in the browser.