I have a 998 I purchased in March 2012 and the other day the GPS stopped working. Worked fine the previous day. Unit states GPS not connected. I checked all connections, rebooted, and reset to factory defaults but nothing solved problem. Unit cables stayed connected between when it worked and stopped working. I am going to take a close look at the puck and the pigtail on unit end, and will also check battery. After reading alot of posts, seems like a fairly frequent issue.