I guess I kind of took that for granted as part of a certified installation. It also needs to be approved for IFR approaches, which any reasonable 530 installation will be, but it's technically possible to install one without getting the certification. (Actually that was the situation with my plane's 430 installation when I bought it - just some paperwork and $1000 or so to straighten it out).
Same applies to the RFMS (or AFMS) - when you do the installation they give you a manual, which you are required to keep in the aircraft, thereby ensuring that you are never tempted to spend time reading it.