A CESSNA C177 PLT ENTERED INTO CLASS C AIRSPACE WITHOUT A CLRNC.

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GND TOLD ME TO TAXI RWY 5; UPON DEP REMAIN CLR OF CLASS C. AFTER ACFT CHK; I CALLED PAGE TWR; READY FOR DEP ON RWY 5; AND REQUESTED L TURN ON DEP. THEN FMY TWR 119.0 CTLR SAID 'CLRED FOR TKOF L TURN ON COURSE APPROVED.' THEN I SAID; 'CLRED FOR TKOF ON RWY 5; L TURN ON COURSE.' AFTER CLRING THE RWY; TURNED ON COURSE 360 DEGS; CLBING AT 500 FPM AND 90 KTS AFTER RETRACTING THE GEAR. THEN AT ALMOST ACROSS THE CALOOSAHATCHEE RIVER; FMY TWR CAME ON AND SAID; 'CARDINAL IDENT.' I DID. THEN FMY CTLR SAID; 'CARDINAL; WHEN YOU GET TO YOUR DEST; CALL ME AT THE FMY TWR FOR POSSIBLE CLASS C DEV.' UPON ARR AT LAL; I CALLED THE FMY TWR 119.0 CTLR. HE ASKED FOR MY NAME; ADDRESS AND PLT CERTIFICATE NUMBERS. MOST OF THE FLTS I USE 'FLT FOLLOW.' THAT DAY WAS VFR TO PERFECTION; SO I DID NOT USE RADAR. NORMALLY UPON DEP WITH RADAR; 'REMAIN AT OR BELOW 1500 FT MSL UPON DEP UNTIL DEP CTL 126.8 ADVISES OTHERWISE. MY MIND SET THAT DEP ON THAT DAY WAS TO START CLBING TO ALT AFTER XING THE RIVER. IF THERE WAS A 'POSSIBLE CLASS C DEV' IT WAS MARGINAL. IN THE FUTURE; AS ALWAYS; I WILL BE MORE AND MORE ATTENTIVE TO ALTS.