[CA] Help With Setup

[wp250outrage]

With a new Boston Whaler 250 Outrage on the horizon, we have decided to go with a dual screen setup (Axiom Pro RVX 12" accompanied by an Axiom pro S "Dual Screen") 24" HD Color Radome and a ray 260 modular VHF. This boat has a lot of electrical systems in addition to the aforementioned electronics but only two batteries. My question is will those 2 batteries be enough to run all of these electronics simultaneously or will 1 or 2 additional batteries need to be added to feel comfortable with the setup when out on the open ocean.

Additionally I have a few questions about adding Navionics cards to these displays.

is it possible to add a charting card along with a fishing hot spots card and run them simultaneously with each other? i.e. overlay the fishing spots on the Navionics chart?

Thank You,

wmp