Well Amazon returned the 210.
Called Fusion and was told to wire any new radio similar to a car. Yellow to +12v and red to ignition or switch +12v.

Bought another 210 fr crutchfield (authorized fusion/Garmin vendor) amd just installed.
Wire red to aux switch on dash yellow to constant +12 under dash. Hope this last longer than 2 weeks or I'm switching companies.

I do like the switch for the radio. It doesn't kick off turning the key or starting the boat. The constant +12v should keep the transistors powered so they don't power spike with each cycle. I shall see.