Hi John. I am pondering of porting flARQ to PocketDigi. I find it very useful to backpackers for sending things like their travel logs or small images. After this port is done, I would like to try to extend it by memory ARQ and increase hamming distance of control packets. > The interface with the GPS could be identical to the one used in Linux > through a serial port (real or virtual as with Bluetooth). Regarding the > modem speed, PSK63 as available in PocketDigi is already quite useable for > position reporting and small emails and maybe faster speeds like psk125 or > 250 may be added later on if processor speed and other timing issues allow > it. I will not implement it as it would probably be used by a marginal number of HAMs only. You are free to implement it yourself. 73, Vojtech OK1IAK