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Welcome to the habner-g12 wiki! Here is the basic setup required to work with the current version of the board:

External Components: AVR ISP programmer, any will work. FTDI to usb board of some sort for debugging.

Connections: Since I can't upload a picture directly I'll do my best to explain the necessary connections to program and debug the boards.

Orient the board with the AVR / GPS chip on the top (radio transmitter on the bottom). Pin 1 is indicated by the reset button and layout follows standard IC pin layout / numbering.

• Pin 1 -> AVR ISP RESET
• Pin 2 -> N/C
• Pin 3 -> FTDI RX
• Pin 4 -> 1.5v - 4.5v
• Pin 5 -> N/C
• Pin 6 -> GND
• Pin 7 -> N/C
• Pin 8 -> AVR ISP MOSI
• Pin 9 -> AVR ISP MISO
• Pin 10 -> AVR ISP SCK

Programming: Once these are connected flash the arduino bootloader. Once the bootloader is installed open the firmware from this github and edit it to suit your setup (ie replace callsign / comment with your own). Once this is set program the board and check the serial output on the FTDI, you will see what looks like garbage, this is a good sign and normal.