Last I played with consumer GNSS hardware much, the SiRFstarIII was considered very cool.

I just ran a new NEO-N9M overnight under a residential roof (no survey mode or anything) and got this wonderfully clean pattern.

All units are meters. I don’t know what pAcc actually is and neither does the official documentation.

This is like $50 for a USB-capable board with shipping and tax from a reputable seller. I’m delighted.