Pros cons of anchor buoys?

[Porchhound]

I've never used one but it doesn't look like a bad idea. What's the consensus?
What about anchor alarms? I've seen boats drag anchor in Roche Harbor in crowded conditions.

 

[O C Diver]

Some good information here on anchor buoys:

https://www.trawlerforum.com/forums/s3/trip-line-tie-wrap-60818.html?highlight=Anchor+buoy

Ted