Two different up-dates. Software updates are here:
https://www8.garmin.com/support/software/marine.html
Map up-dates have been difficult to get for at least the last year or so. Just one of my complaints about Garmins website management. People have been complaining that they cant download them from the website and are forced to call Garmin to have an SD card sent. You have to be careful or they sometimes send you the wrong card and your forced to leave it in the plotter as it wont up-date the internal maps.