THE PILOT OF A LIGHT AIRCRAFT ENTERED THE TRAFFIC PATTERN OF A TOWER CONTROLLED AIRPORT AND LANDED WITHOUT CLEARANCE BECAUSE HIS GPS NAV DATABASE WAS OUT OF DATE.

Narrative

ENTERED THE DOWNWIND AT THE ZZZ ARPT UNAWARE THAT THE TWR WAS IN OP AND HAD DIALED IN THE WRONG RADIO FREQ. TFC WAS OBSERVED ON FINAL AND HOLDING SHORT FOR DEP. MAINTAINED ADEQUATE SPACING WHILE BROADCASTING INTENTIONS OVER MY RADIO AND LANDED UNEVENTFULLY ON RWY XX CLRING THE ACTIVE AT THE FIRST TXWY. GND TAXI TO PARK I WAS GIVEN GREEN LIGHT GUN SIGNALS FROM THE TWR AUTHORIZING CLRNC TO CROSS THE XING RWY AND ONCE PARKED I HEADED TO THE TWR TO TALK TO THE CTLR. I TOLD HIM I HAD BEEN TO ZZZ ONCE BEFORE; YRS AGO AND THAT MY GPS DATABASE SHOWED 122.7 AS THE FREQ. HE ADVISED OF THE CHANGES AND GAVE ME THE CORRECT FREQS FOR DEP. I APOLOGIZED; FILLED UP MY TANKS WITH FUEL AND DEPARTED AFTER THE TWR WAS CLOSED; USING THE APPROPRIATE GND AND CTAF FREQS. NEGLECTED TO MAINTAIN UP TO DATE DATA IN MY GPS DATABASE AND DID NOT REVIEW ZZZ SECTIONAL PRIOR TO ARR. NEGATIVE RADIO RESPONSES WHILE BROADCASTING IN THE BLIND SHOULD HAVE BEEN AN INDICATION THAT SOMETHING WAS WRONG. MY BEST OPTION WOULD HAVE BEEN TO DEPART THE TFC AREA; MAKE A CALL TO ANOTHER PLT ON MY FREQ WHO POSSIBLY COULD HAVE ADVISED ME OR REVIEWED MY OWN SECTIONAL. THIS INCIDENT HIGHLIGHTED THE NECESSITY TO BE DISCIPLINED IN PROPER ARPT ENVIRONMENT PROCS; REVIEW OF THE AIRMEN INFO MANUAL AND PROPER PREFLT PLANNING WHILE CONSIDERING A CONTINGENCY OF RADIO OUT PROCS. I MISSED IT ALL AND AM QUITE EMBARRASSED TO HAVE ENOUGH EXPERIENCE TO ADEQUATELY KNOW BETTER.