Hello all: I have a 5539 Carver Californian that has older electronics. When I purchased the boat in San Diego which is where we still are the boat was basically a floating Condo for a couple from Scottsdale and so I have had to do quite a bit of deferred maintenance, as well as figuring things out. As far as electronics it has the following: Simrad Auto Pilot AP22 works well but want to figure out how to link to my Furuno GPS. Furuno Navnet chart plotter and sounder: the sounder was turned off and so I had do figure that one out. I would like to get a second one so that I can avoid the slit screen Furuno GP32 small unit can't really figure out it's usefulness but have a side story for another time suggesting this is good to have. Now for my post. It has a good old Raytheon R41XX Raster Scan Radar with CRT display it is an old unit but works well with the 48" open array Radar that it has 4kw I believe. I want to start doing some upgrades myself and I think this is a good place to start but not sure if I need to replace the Array and everything or if I can use the array and upgrade the screen. Advice. I will add pictures.