I have abuddy wanting to buy my humminbird 899 and wanting to pay me way more than whats its worth sold used (in my opinion). I told him his offer was too generous and he told me that he wanted My unit with MY waypoints because its set up just the way he wants it. I told him he could buy a new one for a tad more money and I would set his up and give him my waypoints etc. He declined he wants MY unit. So My first question is....

1:Should I take his offer and buy a Helix 9 and upgrade the transducer for a lil more money than what my buddy is offering me. Question is...Is the helix 9 considered an upgrade? I like the fact that it has autochart live built in.

2: (This is the most important question) I see where the Helix 9 can communicate wirelessly to other units. But can I still use the cable so it will communicate with my Humminbird 859 that I have on the front of my boat? Because my 859 will not communicate wirelessly. I just bought the durn cables so my 899 and 859 will communicate and I dont wanna feel like I'm wasting approx $100 and be back in the same boat (no pun nitended) with 2 units that wont communicate. Thanx for any advice in advance!