A C172 STUDENT PLT GETS LOST ON A SOLO FLT AND LANDS AT SBY ARPT WITHOUT A CLRNC.

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MY RTE WAS BWI TO GEORGETOWN; DE. I GOT OFF COURSE ON THE WAY THERE AND BECAME DISORIENTED. I TOOK VOR RADIALS; BUT INTERPED THE FIXES IMPROPERLY. I ENDED UP W OF WHERE I THOUGHT I WAS (OVER TOP LAUREL); RATHER THAN GEORGETOWN OR THE 230 DEG RADIAL. MY COURSE S TOOK ME TO SALISBURY; WHERE I SAW THE ARPT. AT THIS TIME I DID NOT KNOW WHERE I WAS; ONLY THAT I NEEDED TO LAND THE AIRPLANE. IT BECAME KNOWN TO ME THAT I WAS AT SBY ONLY AFTER I LANDED. I ENTERED SALISBURY FROM THE N; FLEW THE PATTERN AND LANDED; MAINTAINING VISUAL CONTACT WITH OTHER ACFT. FROM THERE I RE-PLANNED MY TRIP BACK TO BWI; FILED BOTH FLT PLANS; AND RETURNED HOME. AT SALISBURY I DISCUSSED THE INCIDENT WITH AN FAA OFFICIAL; WHO DECIDED TO TAKE NO ACTION. SUPPLEMENTAL INFO FROM ACN 595688: THE SIT I AM RPTING INVOLVED A STUDENT PLT ON A SOLO XCOUNTRY. I HAD FLOWN 2 DUAL XCOUNTRY FLTS WITH STUDENT PRIOR TO SOLO INCLUDING THE DAY BEFORE. IN ADDITION; WE HAD ANOTHER DUAL FLT WHERE WE COVERED DIVERSIONS AND LOST PROCS. STUDENT PLT PERFORMED COMPETENTLY ON ALL 3 DUAL FLTS. AS A RESULT; I ENDORSED THE STUDENT PLT'S MEDICAL CERTIFICATE AND LOGBOOK; STATING HE HAD RECEIVED XCOUNTRY FLT TRAINING. IN ADDITION; I ENDORSED THE STUDENT PLT'S LOGBOOK STATING HE WAS PROFICIENT TO CONDUCT FLTS IN CLASS B AIRSPACE AND CLASS B ARPT. STUDENT PLT BEGAN SOLO XCOUNTRY BWI-GED. DURING FLT STUDENT BECAME DISORIENTED AND LOST. STUDENT PLT FLEW WAY OFF COURSE AND FOUND THE ARPT AT SBY. STUDENT PLT PROCEEDED TO ENTER CLASS D AIRSPACE AND LAND AT SBY WITHOUT CLRNC OR 2-WAY RADIO COM.