I have a Lowrance X47 TX mounted on the dash of my Nitro. I went to Bass Pro today and the gentleman told me the only units compatible with my transducer and set up is the Eagle 382 (not color) and the Eagle 502C. There was one Lowrance GPS unit but it was $650. Too much for me. Are the Eagle units any good? Don't understand why they don't make any Lowrance units that are compatible. I guess noncompatible means I would have to install another transducer and wiring. Should I get one that is compatible or pay someone to install a different unit? I already have Garmin maps but of course most of them don't work with Garmin.