GPS speedometer stopped working right at end of season.
Any suggestions were to start looking for problem.
Will check connections - do these have any common problems?

Probably a dead battery in the antenna. Do a search for GPS antenna battery and you will find lots of info.

Bottom line....$$$$ to get it fixed or you can connect it to your GPS for free.

Usually if the battery in the antenna takes a $hit, the needle on the speedo goes to around 10 oclock position with key on.

You can get a new antenna. Some have replaced the battery with success. I wired mine to my chartplotter to send the speedo its signal.