I have the issue of the latency in the dynamic response of the EM406 GPS in binary mode finally resolved: you have to run at 57,600 baud in binary mode. Apparently there is a large communications buffer in the EM406 that gets flushed by the carriage return/line feeds in NMEA mode, but which does not get flushed in binary mode, unless you run at 57,600 baud. There must have been a memo on this, bu…