The MMRA operates twenty repeaters and one APRS digipeater at eleven locations in Eastern and Central Massachusetts.
There are also several non-MMRA "affiliated" repeaters capable of linking into the MMRA network.
MRE, HOP, and SBO can only link to HUB1. All others may link to either HUB1 or HUB2.
Finally, HUB2 may link to HUB1.

The MMRA Operating Guide provides information on how to operate on MMRA repeaters.