Belfast is close to where I live and I do sail in there often. The harbor does have a large mooring
field and according to the Harbor Master (Kathy Messier), there are opening for more vessels.
The harbor is not very well protected and those who are living on the moorings sometimes complain of the uncomfortable motion when the winds are from the E, & SE, & NE. There is a strong current
there as well during flood and ebb tides.
Saying that, I am not aware of any problems with boats being secure there. The harbor can be reached at 207 338-1142