I was having problems with my 3210 Garmin shutting off so I purchased a new 4210 about two weeks ago. I also purchased a 24gsd black box with the 4210 and was having problems hooking up so I called Garmin for help. The tech support person told me that Garmin had stopped making the 4210 on Tuesday. I told her I was having problems hooking the 4210 to the 24gsd black box as the 22 gsd worked with the 4210 but the 24gsd would not show that I had sonar only a message that no transducer was hooked up. The 22 series used a 6 pin connector and the 24gsd has an 8 pin connector but there is an adapter box to make the conversion. Has any one had this problem? Also my 4210 will change time while I am going on a route. The arrival time will be 2 hours off from the right time. I told Garmin about that problem and they said they would get back with me. As far as the 4210 goes I am not impressed with it at all. They have taken many of the user friendly items away and made the unit where you can not adjust the settings like time, turn radar on by just pressing a single button, or scroll thru your different by hitting just 1 button. Also note that three people that I know all their Garmin 3210 plotters quit working with the last 60 days.