IFR with a VFR GPS

Jonathan Goodish wrote:
Feature implementations should be readily apparent.

it certainly is but everything behind the scenes is not.
This includes product design and stability, product
serialization (product tracking), documentation for
installation and servicing, etc. For instance, a certified
IFR GPS will definitely require more testing during
the design and release as well as during the installation
than a non-certified unit. Is this apparent to the user,
no, it is not.

Gerald Sylvester