A lot of things to consider there ...... Another option would be to put the Helix 12 up front. The Larger brighter unit would be good when you are standing and are further away from it. You could also move the 788 to the console and have 2 units....dedicate one to mapping.
With the Helix units, you can't share the heading info without also sharing the GPS info from the HS GPS ....You can with the Onix.
Sharing between the 98 series and the Helix is a little more iffy than between 2 Helix or the 99 series....What Humminbird told me was that the new can see the old, but the old cannot see the new. There is a matrix on Humminbird's website that I have lost track of that shows what can be shared. I will post a link to it if I can find it.......Waypoint sharing won't be a problem, but the Chirp on the Helix 12 also creates some 2D transducer sharing issues to a non chirp unit.
I haven't set up a NMEA2000 network, so can't help there.


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