OK I have been doing some additional reading. The Helix 7 I was originally considering was the HELIX 7 MEGA SI GPS G4. I don't think I will be doing anynetworking. I am reading reviews that say the screen is too small for clear SI and not to mount the transducer to the trolling motor because it will be even less clear as I move it about. Any truth to these? I am now thinking Helix 7 Mega DI GPS G4 might be better.