A software thing I built: GPS on a 25MHz 486-SX

A software developer built GPS navigation software for a 25MHz 486-SX processor in the 1990s, using the Hipparchus library which employed integer-based mathematics and Voronoi cells instead of floating-point calculations to achieve real-time moving map display on severely limited hardware. The project was completed successfully but the client experienced financial difficulties, resulting in the developer losing access to the work, and the technology's ultimate fate remains unknown.