I'm thinking of buying the Raymarine Axiom 7 but am not sure of which unit to buy. I know I want it to have RealVision 3D, but i'm not sure if I need one of the "charts" listed on the homepage. The choices on the page are LNC, NAG, and CSA. I pretty much only fish small lakes, most of which are not mapped. Any suggestions for which chart? Or do I even need one. Also, there is an option for an RV-100 transducer. Is this required for the RealVision 3D? or is the included transducer enough.
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