I have a Navionics Premium East SD card for sale. I have used this on my Humminbird GPS units. It is the large SD format, not micro SD. It covers from TN to South Carolina all the way to Maine. I upgraded my units and no longer need this. On Amazon and eBay they are selling for a whole lot more $$. I'll take $100 and ship it priority mail for free. PM me here. PayPal preferred.