Wizard of Draws wrote:

Renters don't have the option of installing IFR certified GPS units in the
aircraft they fly. As the next best option, I bought an Airmap 2000C.

Renters do have the option of not renting planes that aren't equipped the
way they want. We're rapidly getting to the point where anything that
doesn't have at least an en-route IFR certified GPS is unmarketable as a
rental. My club is already on its third generation of GPS boxes.