PCB design is underway, 1st time designing a PCB and I found the learning curve pretty easy having watched zero tutorials.

Tried to keep it simple and only use a two layer PCB.

Added caps to the keyboard, oled and GPS to help with filtering, 0.1uf recommended but end user can just bridge the connection with solder.

Added Shottky Diode to the VSYS lines.

So today I have added some diodes and solder bridge pads for instances where the GPS module used has RX and TX pins reversed. The ATGM board I have is VCC, GND, TX, RX and the uBLOX is VCC, GND, RX, TX. This will allow the end user to specify their layout. Also for the ATGM to remain compatible with the board will have to be rear mount.

Next couple of days I am going to have a play with the layout before finalising things.