Re-read my post. I didn't state C58s set-up wasn't good. However in light of the very real
bullet points I made above (which ARE realities when BWC), and solo handling issues, I simply do not believe it is the most functional way to go ... though again, I don't begrudge C58 his preference.
I also think most would agree that 2 sources of data is better than one, so they can validate each other.
I'd much prefer confirmation that what some human being is claiming to see or not see (a species known for making "errors of judement"), doesn't disagree with the sonar generated image on my Raymarine
In fact if I had to choose between the two, unless dealing with an extremely experienced sailor up on the spreaders, I'd trust the sonar!
With no disrespect intended, unless you've experienced the situation on several occasions, I believe it would be difficult to offer an "informed opinion".