This small section of the M & M trail is a 4 mile out-and-back hike from Mt Harris Rd in Granby, MA over toward Federal St in Belchertown, MA.
The hike is fairly moderate considering there are multiple uphill climbs and a steep grade going downhill toward Bay Rd. When you reach Bay Rd, hike south along the eastern side of the road until you see the white blazes again, just before the turn to Old Bay Rd. The trail will continue uphill for a short while before heading back downhill toward Federal St.
The GPS data only goes about 1/2 way from Bay Rd over to Federal St. Follow the white blazes.