...Simplifying Installation

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However, the FAA recognizes that GPS technology is now common and considerable experience has been obtained in the installation of GPS. The AEA cautioned that the revision does NOT mean that all GPS/WAAS installations can be treated as "minor alterations," but rather allows GPS/WAAS equipment to be installed using the same criteria that a repair station would use for installing traditional navigation equipment. For example, under the new guidelines, installation of GNSS (GPS/WAAS) navigation equipment that only interfaces with an antenna, power, ground, an external HSI/CDI with a single source selector switch, and a left/right (deviation-based) autopilot would typically be considered a minor alteration.