Wanting to change transducer on Helix 7 unit to get better SI views. Does anyone know the advantage of going to XHS 9 HDSI vs using the compact transducer (XNT 9 SI 180, I believe) that comes with FF? Looking at HB website it looks like 800mhz is available for the upgrade but I don't think my Helix 7 supports that. If 800mhz is the only difference and my unit will not accept 800, it want help. Lots of info on Humminbird website but not easy to use. Any advise would be appreciated.
Thanks, Ray