A card for the HQ, then each hub: port name, Headquarters/Hub, level (of 40) with an XP bar and XP to the next level, the upgrade tree (points to spend, the four paths with pips, their bonuses and + buttons), its Industry section (see Headquarters and hubs), and traffic (ships docked there now, deliveries unloaded there, pay received there), with a "Show on map" button that centers the World map on it.
Then a "New hub available" card (how to found one, with a button to the map) while a hub can be founded, and a "Next hub" card with the company level that unlocks the next one.
Maritime Empire