After securing last eve in Solomons MD, I started playing with my Raymarine’s RADAR. Doppler is not a setting that I usually use underway. I usually have it on chart plotter overlay. So the echos show up on top of the chart with ATONs and the land around us.
Here is a pic of what I saw in Doppler radar mode when I first turned it on.
Sure enough on my starboard quarter, there was a boat approaching us, going by us while we were tied up at the T-head dock.
After this boat got passed us, the radar echos from this boat turned green on our starboard bow. Green because he is a moving object but moving away from us.
You might ask, “What is the stationary (white) object on the other side of the channel, just forward of your starboard beam?”
In chart overlay mode this is what that ATON looks like up close… here doppler is off, and all echos are yellow or orange.