I brought this up in another thread and have memories of it but can't find any info online anywhere.

It was a Gameboy cartridge that had street maps of the US like an early Google Maps. I'm pretty sure you could enter a starting point and destination and it would tell you a travel route in some fashion...though I could be remembering that wrong. I just remember thinking it was really cool from a pre-GPS perspective.

I'm sure it would have been an unlicensed/order from the back of a magazine type thing but does anyone else have any knowledge of this?