AN EMB120 PIC; FEELING TRAPPED ON HIS RAMP; SURROUNDED BY BAGGAGE CARTS AND VEHICLES; OPTED TO FOLLOW MARSHALLER'S SIGNALS TO MOVE ACFT WITHOUT CLRNC FROM COMPANY RAMP CTLR AT ATL; GA.

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AFTER LNDG ON RWY 27L TWR CLRED US TO CROSS RWY 27R; JOIN TXWY L AND CONTACT GND. WE WERE UNABLE TO CONTACT GND WHILE TAXIING TO RAMP Y DUE TO HIGH RADIO TFC. ACFT BEHIND US WERE CLRED TO TAXI. WE CONTINUED TO RAMP Y AND ASKED RAMP Y CTL TO NOTIFY GND OF OUR ATTEMPTS TO CONTACT GND. HIS CLRNC HAD US ENTER THE RAMP ON THE R; TRANSITION L; AND HOLD SHORT OF THE CTR ROAD. AS WE APCHED THE ROAD; RAMP CTL ASKED THAT WE TRANSITION L -- WE DID. WE UNDERSTOOD THIS AS AUTH TO CONTINUE (FO WAS OPERATING THE RADIO WHILE I MONITORED RAMP AND COMPANY FREQS -- HVY RADIO TFC). I STOPPED THE ACFT SHORT OF GATE TO ALLOW ROOM FOR A DEPARTING E120 TO PUSHBACK. AFTER WE STOPPED; ABOUT 5 BAGGAGE CARTS ACCUMULATED ON THE OTHER SIDE OF THE CLR AREA FOR THE DEPARTING ACFT. GND MARSHALLERS OPTED TO HAVE US MOVE ABOUT 100 FT N; WHICH WE DID UNDER DIRECTION OF A MARSHALLER. WE AGAIN WERE UNABLE TO CONTACT RAMP CTL DUE TO HIGH RADIO TFC. AFTER WE STOPPED; RAMP CTL CONTACTED US THAT WE SHOULD HAVE NOTIFIED THEM BEFORE MOVING. BECAUSE OF THE DEPARTING E120 BEING PUSHED TAIL FIRST TOWARD US; THE RAPIDLY ACCUMULATING NUMBER OF BAGGAGE CARTS (AN INCREASING DENSITY OF VEHICLES ONTO TERMINAL SIDE OF OUR ACFT) AND WITH NO VEHICLES ON RAMP SIDE OF US; AND UNDER THE GUIDANCE OF COMPANY GND MARSHALLERS; I ELECTED TO MOVE THE ADDITIONAL 100 FT N WHILE I DIRECTED MY FO TO NOTIFY RAMP CTL. I BELIEVE THIS WAS SAFER THAN REMAINING IN A SPOT WHERE SO MANY VEHICLES WERE CONVERGING. AT NO TIME DO I BELIEVE ANY VEHICLE WAS IN IMMINENT DANGER OF COLLISION.