Hi *arwooldridge and **julio menezes Thanks for your support. I solved the problem. I changed the makefile and deleted the following settings: * "CTARGET= -DENAGLO -DENAGAL -DENAQZS -DNFREQ=3" whitout them I was not able to get Glonass satellites. So the solution was just to recompile rtkrcv with the default makefile. Regards Stefan