EMB-505 Captain reported a 'GEA 2' failure during cruise flight and diversion to an alternate airport. Captain expressed concern about the lack of information in aircraft manuals to determine status of landing gear.

Narrative

During cruise flight at FL410 the aircraft experienced a GEA 2 Failure. This resulted in many system indications being lost. One of the affected system indications was the right main landing gear. Due to the landing gear indication system showing that the right main gear was in transition and was unsafe for landing; I ran all applicable checklists and decided the safest option was to divert to ZZZ in case of gear collapse as they have the best emergency equipment in the area. I [advised ATC] and landed the aircraft normally with degraded system indications. The aircraft was taken to the gate under its own power and the passengers deplaned. Suggestions: There needs to be more information in the manuals about what the purpose of the GEA 2 does. In the current Phenom publications I had access to; it simply says 'crew awareness' when the CAS (Crew Alerting System) messages are referenced. Due to the fact that we are receiving many erroneous indications and the landing gear being included in this; I felt like I was put in a position where I was unable to determine that the gear was going to be down and locked.