Garmin will be ending WAAS upgrades for non-WAAS GNS 400/500 series products on May 29, 2020.
https://www.garmin.com/en-US/aviati...waas-upgrade-for-non-waas-gns-400-500-series/
https://www.garmin.com/en-US/aviati...waas-upgrade-for-non-waas-gns-400-500-series/
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