Marathon Florida anchorage ?

[Kettlewell]

Everything within the reef is pretty calm most of the time.

Sure, but if you have no engine and can't easily and quickly move you will find that some of the time it is nasty out there. IMHO when anchored in the Keys you need to be prepared for wind from all 360 degrees, plus the potential for strong thunderstorms or tornadoes. I've rotated around several circles in one day with shifting winds from all directions.

[Thomas1985]

And shallow… use a lot of caution in a keel boat when navigating outside of the channel.