Well, like I said, I have only seen it over the shoulder of someone else at the helm and never used it myself.
But it looked extremely useful...not to be used all the time but as an option perhaps.
A search for overlay in this forum gave this
Crazyhorse (how is his cabin rib coming along btw?) seems to have opted for this feature
a bit more than a year ago..
The theoretical advantages are I guess obvious..
it should give you a very fast overview of what is going on with other boats around you, without having to refer positions between the chartplotter
and radar displays and the closest you can get to having the other boats moving about as numerical dots in your chartplotter, until those digital ID transponders for ships become
a reality for recreational vessels next month...;-)
..but seriously..it should be a great feature if properly implemented as a nice read-out.
I mean GPS chartplotting is already such an incredible luxury for anyone who has spent more than a few years at sea from time to time and remembers the old days annoGPS.
Now add basic radar functionality scaled and mapped into the same display
I mean...who would have thought that would be possible in a recreational vessel..
These are the good times.
Safer, further and more fun too..