Mart,
The current S76 stability system is a Honeywell SPZ7600 with a few Sikorsky enhancements. It has basic stability, attitude hold, airspeed hold, rate of climb hold, nav tracking and (with the SAR kit) auto approach, hover hold and rear crewman hover position trim. These capabilities are found in many of the top of the line helos these days, frankly.
There is an older system on many A's and B's that is a basic stability system (so-called SAS II). It does not nav track nor does it do automatic pproaches, but its flight handling and stability is mighty fine.