How can a pilot determine if a GPS in their aircraft is IFR approved?

The best approach for a pilot to determine if a GPS in their aircraft is IFR approved is to review the flight manual supplement. The flight manual supplement will contain detailed information about the aircraft’s instrumentation, including any GPS systems installed. This supplementary information is essential for understanding the specific capabilities and certifications of the GPS equipment, particularly in terms of its adherence to IFR (Instrument Flight Rules) standards.

The flight manual supplement not only lists the approved navigation equipment but also indicates the operational specifications and limitations relevant to IFR operations. This is crucial for ensuring that the pilot is compliant with regulations and can operate safely under instrument flight conditions.

While the other sources, such as the GPS operator's manual or the aircraft's owner handbook, may contain relevant information, they do not specifically focus on the IFR approval status of the GPS for use in the aircraft. Contacting the aircraft manufacturer can provide additional insights, but the most reliable and direct source of verification is the flight manual supplement, as it is tailored to the specific aircraft and its installed systems.