Thanks for the info guys. I have read a few places that a lot of newer cards won’t work in these units because the unit can only use up to a 2gb card. Are any of the new cards (navionics, lakemaster, etc…) useable in these units or will I need to purchase a used older card?

Has there been any additional information figured out on this? I recently got a boat with two lowrance lcx 27c units and am looking to get a card for them. Not sure what is the best option to get?