Propeller_GPS is a spin program that I wrote to learn how a GPS unit works. I used the NEO-7M GPS unit which is available at a very
nominal price. Eventually, I added a 64 x 128 OLED that incorporates the SSD1306 controller. This is also readily avilable at a very
nominal price. With these two modules, and a propelle such as the Propeller Mini, you can construct your own portable GPS unit.