PLT OF AN SMA SEL INADVERTENTLY PENETRATED CLASS B AIRSPACE DURING A VFR DEP FROM ONE OF MANY ARPTS BENEATH THE AIRSPACE. IN PROX OF MULTIPLE ARPTS.

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DEP FROM TEB UNDER DEP CTL WITH IDENT CODE ENRTE TO ORH. CLR SKY 30 NM VISIBILITY. INSTRUCTIONS WERE TO MAKE A L TURN AND NOT ENTER CLASS B (NY) AIRSPACE (ENRTE TO VOR CMX VIA TAPANZEE BRIDGE). AFTER CLRING ARPT VICINITY AND MAINTAINING 1500 FT FOR ABOUT 3 MINS AT 160 KTS I BEGAN A CLB AND PENETRATED THE FLOOR OF CLASS B AIRSPACE WHICH I HAD THOUGHT WAS 3000 FT FOR MY AREA. BUT THERE WAS AN 1800 FT EXTENSION I MISJUDGED ON MY TCA CHART. THIS WAS AN UNFAMILIAR ARPT AND THE FIXES I WAS USING WERE A MI AHEAD OF THE PLANE. DEP NOTIFIED ME OF THE PENETRATION AND I IMMEDIATELY DSNDED. I WAS THEN HANDED OFF TO NY DEP AND GIVEN PERMISSION TO ENTER THE AIRSPACE AND CLB. UPON REFLECTION AND STUDYING THE CHART CLOSER I COULD SEE HOW I CLBED TOO EARLY IN THE CONGESTED SPACE AROUND TEB. FORTUNATELY THERE WERE NO OTHER PLANES IN THE AREA (BUT THAT IS WHY I WANTED TO CLB OUT OF POSSIBLE LOW LEVEL POTENTIAL CONFLICTS; ASAP). THE 30 NM LORAN WARNING IS FINE BUT ONCE UNDER A TCA/CLASS B VISUAL REFS ARE PRIMARILY THE FACTORS TO DETERMINE LIMITS UNLESS A FIXED RTE IS PLANNED; AND THEN THE DME READOUT WOULD SOMEWHAT HELP. ALTERNATIVELY WHEN WARNED TO STAY CLR OF CLASS B AND ALT REMINDER WOULD OFFER ADDITIONAL HELP TO THE PLT WHO IS JUGGLING ENOUGH CHKLIST ITEMS AND TRYING TO GAUGE LOCATION VISUALLY. A MAP IS NOT ALWAYS PRECISE.