What is this all about , sat nav related

There’s a saying in the Tech world.
Any device is only as good as the information punched in by the idiot operator.

Or take your pick of these well known error codes

PEBKAC problem exists between keyboard and chair
PEBCAK problem exists between chair and keyboard
PEBMAC problem exists between monitor and chair
ID-10T/1D-10T idiot error
PICNIC problem in chair, not in computer
IBM error idiot behind machine error