Skyhawk 172/Cutlass 172
Flight Crew Private
Flight Crew Last 90 Days 6; Flight Crew Total 586; Flight Crew Type 586
Situational Awareness; Training / Qualification
ATC Issue All Types; Airspace Violation All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Air Traffic Control Issued Advisory / Alert; Flight Crew Exited Penetrated Airspace
ATC Equipment / Nav Facility / Buildings; Aircraft; Human Factors
I was flying cross country to Santa Monica; CA (SMO) at 4;500 MSL along V-186 with VFR Flight Following.  About 20 NM West of PDZ VOR; ATC advised that I was inside LAX Class Bravo airspace and gave me vectors to the North; after a brief period of time the controller advised that I could resume own navigation. My VOR indications the time that the controller advised that I was inside Class B airspace were that I was directly on centerline of V-186.
C172 pilot; west bound on V186 near EMT at 4;500 feet is informed by ATC that he has drifted into Class B airspace and to turn right to return to the centerline. The reporter's indications were that he never left the centerline.