I have used Reyax modules with RS-232 outputs for a long time. The company seems to be quite good. I trust them to be a reliable supplier and have never had any problems with any of their units despite being used in some rather harsh conditions. -------------------- > Some time ago, I bought two different modules from Reyax on ebay. One module had a ublox M8N. Recently, I did some reading on several drone forums about fake ublox modules from China. It seems that modules from quite a few vendors are not genuine. From the information presented about identifying the fakes, I am fairly confident that the modules I bought from Reyax are genuine.