The Simrad 4G is a great radar. There's no comparison for close-in performance, which is what I care more about. The only problem with these radars which are FMCW, not pulsed, is that they're more susceptible to interference from traditional radars on the same frequency. For example, one Washington ferry will produce lots of radial lines on the display when it gets within a mile or two, while another won't.
You can get the 4G and an NSS8 for under $4k and easily install them yourself. The radar communicates via ethernet. The supplied network and power cable and connectors are small diameter and easily routed.
I had a Furuno on my last boat and probably would have gone with them again, if they had an FMCW radar.
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