Whats Functional When Obsolete?

There arent many legal absolutes about expired data. But will the boxes keep working as expected?Using Garmin as the benchmark, the navigator will continue to work with obsolete data. Flying GPS approaches with an expired navigator database is a legal no-no, but practically speaking, most boxes will let you do it. We wouldnt make a habit of it, but if that LPV is the approach you really need and youre willing to defend your actions under emergency authority, it can be done. Youll want to carefully check every waypoint on the GPS database against a current chart. You may want to double-check with ATC that you have any NOTAMs or changes for that approach as well.

Key Takeaways:

• While GPS navigators with expired databases often remain functional for approaches, it is legally discouraged and requires meticulous verification against current charts and ATC.
• It is recommended to keep at least one GPS database current for optimal safety and features like cross-fill; however, MFDs enforce strict currency on critical data like approach charts, disabling their display if too old.
• A current GPS can override outdated MFD data for flight plan fixes, but other MFD and portable device data (e.g., terrain) will continue to display even if significantly out of date, potentially providing an inaccurate view.

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