Barnakiel and dacust/Dan are right. My thought is the very first thing to check is your radome alignment. There's a high probability that the radome mount is not perfectly aligned with the fore/aft axis of your boat. Heck, even your fluxgate compass
and possibly even your main magnetic compass
If virtually every radar return on your integrated MFD is a one or two degrees port or starboard of where your MFD plots the landmark/navaid, then you can be almost certain that the alignment is off. On our Raymarine
E-120 Classic, it's simple to go into the radar configuration and adjust the 0-degree bearing mark. Our radome, mounted up the mizzen mast
, is off to starboard by about 1 degree, so I adjusted it accordingly via the configuration menu.
One thing I've found in the few years we've been using radar is that having the radar overlain on the chart is a nice feature to have, but as osirissail basically puts it, to really get the most out of your radar, you have display it without the chart background so that you can really pick out the details.
On our E-120, when overlaid on the charting page, all returns are the same magenta color with no details. On the dedicated radar page, the returns are color-coded much like the weather
radar you see on TV. You can actually see where the rain in that squall really is - and the big freighter in it - rather than seeing just a magenta blob on the chart. But then again, you'd be amazed at the amount of detail you can pick out on an older analog CRT-based radar system. Bottom line is that many "older" vintage multifunction displays like our 2006 E-120 simply don't have the processing power nor the graphics memory and internal bus bandwidth to be able to plot a detailed chart and overlay it with detailed radar imagery in real-time.