Hey BD,
SonarCharts Live works on the Navionics ap installed on your mobile device -preferably a tablet in a Ram Mount at the helm- via your vessels WiFi.
To allow your system to produce the WiFi network, you'll need to add a GoFree WiFi-1 module:
http://www.lowrance.com/en-US/Products/Wireless/GoFree-WIFI-1-Module-en-us.aspxOnce your tablet is networked to the system, a tremendous amount of data, system control and increased screen area is available for your use including real-time depth soundings that can be utilized by the SonarCharts Live function of your Navionics ap.
I have used this system with mixed results in part due to the fact that the iPad I was using at the time was an older, slower model and my vessel speed was fairly fast...not a great combination...
Remember that with your Lowrance or Simrad gear that you can also utilize Insight Genesis:
http://www.lowrance.com/en-US/blog/How-To-Download-Insight-Genesis-Maps/Once uploaded onto the parent website, Insight Genesis takes your depth sounder recordings and incorporates them into existing cartography which is now more precise and accurate due to your personal recordings!