I Stole This Idea.
The ship cards that come with Black Seas are fine, but they could be better!
I stole this idea from the Paul Kingtiger blog. Without shame. His cards are great but I was bored and made my own. I used the same magnets and pins that he recommends, except I put the cards in some thick-ish plastic sleeves. The pins are magnetic and suck magical magnet energy from another magnet on the back.

I made them in Google Slides (what?) for ease of editing. When I need a new ship I can make a card quickly and print it out. Now you're firing with double-shot!
Godspeed.
Currently listening to: Upchuck - Plastic