Electronics issue, Lowrance

I have an older Lowrance unit, I think Lc27 or something like that and it has worked great the last several years, well this year when we went out for the first time the GPS on the unit wasn't showing my speed or the correct tracking.
I initialized the GPS and moved curser to my location but it never worked right. The sonar was fine. It has a puck for the GPS and nothing has been disconnected, I just moved the unit from the console when we were cranking last year to the front for slow trolling but nothing gets unhooked, I intentionally left the wires long so I could move the unit.

Any ideas would be great.

Check the fuse, should be 2 power wires, one to the unit itself and the other is the NEMA power which powers the puck. Might try just unhooking the power for a while and then reconnect it.

Thanks Rees, I will check on power to the puck. I did try disconnecting the power to no avail.