have you tried the eagle website. I downloaded one from hummibird. I have a cuda 168.....Cheap one just 120.00. It seems to work great for me. It draws a good picture of structure.If it is a christmas tree on its side it draws it like it looks. I also have a humminbird tcr-id-1. It works great but the transducer is bad. I called them and they don't make or service it anymore. They said I could use the trade in program. The prices are great $100 less than retail online. I am going to get the Matrix 67 for $289 or the 37 for $159 bucks. The 67 has loads of GPS maps and stuff I ain't smart enough to use.lol