You can command more than one ship at once, provided that the ships under your command have an available captain role. Working Communications and crews that consent to your command by the majority. Each ship for which you are the captain takes their turn on the same round of combat. You can choose which order the ships act in. additionally, on your turn, you can use your action to take any action provided for you by captain role for each ship under your command. 
   you can command a number of ships equal to your Proficiency bonus up a maximum of your Charisma modifier (Minimum 2)