From ICAO guidance:
An RNAV Visual Approach is comprised of a flight path requiring an FMS and use of ground based, space based or onboard navigation aids, followed by a visual track to landing.
These are very specific procedures which require the operator to obtain Civil Aviation Authority approval before its pilots can fly an RNAV Visual.
■Your airline is required to be CAA approved for RNAV Visual approaches. Note that it is possible for an airline to be authorized to fly RNAV approaches, but not authorized to fly RNAV Visual approaches.
■ If your airline is not approved, you should not have the RNAV Visual charts, however,
reports indicate that some crews have had these approaches included in their onboard chart library even though neither they nor their airline was authorized.
From FAA:
In 2010 the FAA issued Order 8260.55 allowing the development of RNAV Visual Flight Procedures (RVFPs) that capitalize on the capabilities of RNAV systems to provide repeatable flight paths, reduce pilot-controller communications and enhance safety through the use of vertical guidance during visual approaches. These RVFPs are not “Public” procedures. Instead, they are approved by a process similar to “Special” IFPs and are only available to part 121 and part 135 operators through OpSpec approval.
https://www.faa.gov/documentLibrary/...er/8260.55.pdf
Yes, it does deepen the mystery...
both are the FMGS database
Yes, they may be. As noted, an airline can be approved, but the crew must also be appoved to use them.