Well I did this. Took all the cards out of booth units. Found LOW using the unit map. Took one card at a time to see what features popped up. After going through six cards I think I have them back in the right Big HD card. Not sure of the version though. It gets confusing because the MN card has some LOW on it. Just trying to stay out of Canada 👍. But here is a thought. The gentleman that does the You Tube Videos for hummingbird. Throw a bunch of unmarked micro cards in a pile and see how long before he lets out a cuss word. Seriously thanks for everyone suggestions it did help