What next : do not compare following a published RNAV APP with trying to get to a VFR field , buiding an APP on your own using a GPS .
For info the requirements to follow a published RNAV RNP 1 GPS APP procedure :
No single-point-of-failure can cause the loss of guidance compliant with the RNP value associated with a missed approach procedure. Typically, the aircraft must have at least dual GNSS sensors, dual flight management systems, dual air data systems, dual autopilots, and a single inertial reference unit.
His dudeness. Thanks for the link to the video. explains a lot ,if not everything , unfortunately.
Just a final remark, contary to what the Jounalist ( or the Trier Staatanwalt ) said , it is not against the rules to cancel IFR in this situation, i.e. you can always divert to another open VFR field, what is against the rules is flying VFR in IMC.