New updates have just been posted to the Garmin website:
https://www.garmin.com/en-US/support/software/marine/
However, for those of you that prefer to run older GLS10 software (version 2.20 or earlier), note that these latest updates only support GLS 10 version 2.30 and later. If you are running GLS10 version 2.20 or earlier and wish to continue doing so, you should not update the chartplotter to this Q4/2021 software. A change is planned to restore GLS 10 2.20 compatibility with the latest chartplotter release in a future update.
Software versions that are not compatible with GLS10 v2.20 and earlier:
GPSMap products, software version 25.30
echoMAP UHD version 18
echoMAP Ultra version 18.2