Whats Legal When Obsolete?

There are two aspects to the legality of obsolete data: navigation and information. The legality of using obsolete data for navigation can be found in your Flight Manual Supplement. The Limitations section of the Garmin 530W Flight Manual Supplement simply states IFR en route and terminal navigation is prohibited unless the pilot verifies the currency of the database or verifies each selected waypoint for accuracy by reference to current approved data.

Key Takeaways:

• GPS approaches are strictly prohibited under Part 91 if the navigation database is obsolete, as stated in flight manual supplements and AIM guidance.
• For IFR en route and terminal navigation, obsolete database use is allowed only if the pilot verifies each selected waypoint's accuracy against current approved data.
• Using obsolete data for advisory purposes, such as MFD terrain/charts or GPS in lieu of DME/ADF, is generally considered legal under Part 91, requiring pilots to acknowledge potential discrepancies.

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