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Aviation Alerts and Advisories

Service Advisory 2017: GNS 480 (CNX 80) GPS Date


Garmin GNS 480 (CNX 80) navigators are affected.


Beginning August 16, 2020, GNS 480 units may report a GPS date that is 20 years or more in error under the following situations:

  1. If the GPS receiver has not acquired a 3D navigation solution within the last 128 weeks
  2. If a Master GPS Reset is performed without setting the correct date

An incorrect GPS date may result in all installed databases with effective dates shown as not yet effective.


If the GNS 480 reports an incorrect date, do the procedure outlined in the attached Service Advisory while the GNS 480’s GPS antenna has a clear view of the sky.

Service Advisory 2017 Rev A