The SouthPAN GNSS augmentation service (SBAS) covering Australia and NZ is currently planned to be certified for safety-of-life applications in 2028. Is there any way of knowing which models of Garmin's WAAS aviation receivers will properly support SouthPAN once it becomes available? I expect that any current models would work just fine, but I haven't been able to find any definitive information on the Garmin website.
If some sort of enablement is required, would it also be available on Garmin's legacy products, eg. 400W/500W series or GNS480/CX80?
Would standalone position sources used for ADS-B, eg. GPS20A or GTX345 need a firmware update?