Can be done with Nobeltec
(and maybe the new Coastal Explorer?) but I think the equipment
and software would cost far more than a basic radar
I have a JRC 1500 which I see online for $899 with free shipping
(not spamming but it's at Boaters World). It works well and has been reliable. The added advantage is that if my PC dies, I still have the radar to help me navigate.
I have the radar tied in to my nav system so I see waypoints etc. on it, but not charts
overlaid with radar returns - I've heard people say that is an overrated feature they quickly tire of and switch off.