"Auto" chart selection

[buckshot]

How does the "Auto" setting work for charts selection? Are there any ways to help it do a better job?
I would like for the TZT to switch from my inland navigation chart to the offshore charts with better contour lines after leaving the inlet and then switch back on returning to the inlet.
Thanks

 

[Johnny Electron]

Auto attempts to pick the best available from loaded Navigational charts it doesn't switch or consider fishing/bathy charts. Whenever looking at bathy you much switch chart types by swiping up and changing the selection. The only exception is overlay data like CMOR that can be turned on while running it over your navigational charts. Unlike other platforms, Furuno is the only one that allows you to choose the underlying chart below the CMOR data.

 

[danderer]

What defines "best available"? For example in an area I have current NOAA vector and raster and 1-2 year old C-MAP. Auto seems to select C-MAP in preference to the newer NOAA data.

What is the underlying logic here?

Thanks.