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Aviation Alerts and Advisories

Service Advisory 2027: End of WAAS Upgrade for Non-WAAS GNS 400/500 Series


Garmin GPS 400, GNC 420, GNS 430, GPS 500, and GNS 530 units are affected.


In order to support future GNS 400W/500W series repairs, Garmin will be ending WAAS upgrades for non-WAAS GNS 400/500 series products on May 29, 2020. WAAS upgrade orders can be placed up until this date, however units must be received by Garmin by June 30, 2020.

Repairs will be available for the non-WAAS 400/500 series 28v units with 16W COM Transmitter and all 14/28v non-WAAS 400/500-series units. These units will not be able to be eligible for the WAAS upgrade after May 29, 2020, but repairs will continue to be available after this date.

We sincerely regret discontinuing service or support on any Garmin product.

Please visit for your product replacement needs.

Service Advisory 2027 Rev A