Looking for advice from others who have experience with Humminbird depth finder set ups. I am considering a Humminbird 10 CHIRP Mega SI GPS G3N (not sure if the G2N is still available and if so, the difference between the two) to be mounted at the console of my boat and a Helix 10 CHIRP Mega DI G3N on the bow. I plan to interlock the two units together. Looking for opinions, suggestions and advice from others before I start. I want to make sure I do it right the first time.