Do you think I'm dumb? I don't like how condescending you are sir! Of course I looked for "crossfill" and "cross" alone because sometimes you put a dash in the manual.
For "Crossfill" I found:
- Use Crossfill Automatically share route, waypoints and navigation data between two GNS This must be enabled in both GNS devices used in the panel.
And for "Cross-Fill":
- Page 6: When enabled in both GNS, this option allows you to transfer a direct- to destination, the active flight plan including VNAV parameters, any stored flight plan or user waypoints to a second 400W or 500W device. If both units are set to automatic (in the Garmin GNS device settings), a change in the active flight plan, or VNAV parameters, on one unit can also be seen in the other. Initiating a direct-to course to a waypoint on one unit also initiates a direct-to course to the same waypoint on the other unit.
Nothing related on how to activate the option!