I have a Echomap 73dv that has quit working, turns itself on and off constantly. I purchased extended protection from Basd Pro and they are going to replace or refund. My problem is that there is not a 73dv shown on the Bass Pro website or on the Garmin site. So, do they still make it? If not, what would be the closest model to it? 73cv? I don't need side imaging but do want down scan. Thanks for any help.