Pascal Goncalves wrote:
I found this, appears to be a new AIS standalone unit, target to
leisure boat market, that operates similar to a traditional radar.
Costs about 260 pounds.

Despite NASA calling it a radar, it is nothing of the sort. It just
automatically plots AIS transmissions by other vessels - just as you
might plot a position passed by VHF. If the other ships do not
transmit an AIS message, you see nothing.
NASA have subverted the acronym RADAR - in their book it now stands for
Radio Direction and Ranging. In fact RADAR means Radio Detection and
Ranging.