I tried this: server 127.127.20.1 mode 18 minpoll 4 prefer Mode 18 didn't want to work, but mode 16 does work. What am I doing wrong? I verified that the GPS is sending $GPGGA sentences at 9600 baud. Should I try mode 2 at 4800 baud? I am using a Sure GPS on a Windows XP machine, but that shouldn't be a factor?