Nothing I know of specific to DT, but you can get Chris Parker on one of his freqs. Some options:
East Coast Cruising Nets
If you're trying to get wx while out there:
The
ranger station posts wx sporadically. Ask them to update their bulletin board. They also have a
VHF wx station, tho it was out of
service when we were there last year.
You can get wx via
VHF out there with a good high mounted
antenna. Or you can even climb to the top of the fort with a handheld with the right atmospheric conditions.
Finally, we made friends with the workers on the daily
ferry boat. They would download
weather forecasts each day from
Key West and bring them out to us.