Mirror navionics on slave unit

[Mleads310]

For reference I have the following:
Axiom Pro RVX (master), axiom RV (slave), network via Raynet. He digital radar via Raynet to axiom pro. B765 connected to master.

I have the Navioncs card installed in the master unit but can not view it on my slave unit. When I open the charts in my slave unit, all I get is a very generic map with blue for water and tan for land. I've tried to turning off the internal GPS for the slave unit. I also tried changing the chart source in the slave unit (navionics etc).

All other functions mirror and work effortlessly between the two units, radar, Sounder etc.

Question: how do I view the navionics map on my slave unit, that is installed on my master?

Thank you