The idea is to use open-streetmap based tiles as a map source. The tiles are cached in PSRAM and drawn into the framebuffer in SRAM. The bars represent GPS signal strength.
Top view.
Side view.
View of the screen on top of the PCB. Debug code lists the installed hardware.
The GPS signal worked. As long as you didn't wear the device. As long as I don't have an antenna design that is small enough, I'm not going to continue with this project.