This is based on the GNU free track design.
No configuration software is required only a 9600 baud RS232 terminal emulator.
Limited range (tracker only) CPU is a PIC16F628 and the enhanced CPU/TNC model is a PIC16F648, using the same PCB.
The design includes a 5v high efficiency switch mode regulator.
Build level is advanced, as there is quite a few 0603 components and there is components on both sides of the PCB.