C152 PLT CONCERNED WITH LCL; NON-DEFINED; VISUAL VFR RPTING POINT IBND TO HWD ARPT.

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ON A TRAINING FLIGHT INBOUND TO HAYWARD APRT; TOWER INSTRUCTED US TO REPORT 'AT THE 3 CROSSES;' AND TO 'STAY NORTH OF INTERSTATE 880.' I HAVE FLOWN INTO HAYWARD NUMEROUS TIMES; ALWAYS FROM NEAR LAKE CHABOT - AS I WAS TODAY. I KNOW WHERE 880 IS AND I BELIEVED THAT THE '3 CROSSES' HE WAS REFERRING TO WAS A CROSS OF 3 ROADS NEAR 880; SINCE HE DID REFER TO 880 IN HIS INSTRUCTIONS. IN REALITY; THE '3 CROSSES' ARE 3 LARGE CHURCH CROSSES; WHICH ARE BY INTERSTATE 580; NOT 880. SO I WAS ABOUT 2 MILES FROM WHERE TOWER ACTUALLY WANTED ME TO BE. A DAY EARLIER; I WAS AT HAYWARD AND HEARD THE CONTROLLERS REFER TO THE '3 CROSSES' TO ANOTHER PLANE. I HEARD REFERENCE TO MANY INTERCHANGES OF FREEWAYS - THUS LEADING ME TO BELIEVE I WAS IN THE CORRECT LOCATION TODAY. SINCE I WASN'T ACTUALLY 100 PERCENT SURE THOUGH; I SHOULD HAVE STATED I WAS UNFAMILIAR WITH THE REPORTING POINT. THERE WAS NOT A LOT OF TRAFFIC AT THE APRT SO THE MISCOMMUNICATION DID NOT CREATE ANY HAZARDS; OR POTENTIAL PROBLEMS; MAINLY JUST A MISUNDERSTANDING. TOWER COULD HAVE TOLD ME THEY WERE BY 580.