A PLT'S LACK OF FAMILIARITY WITH COCKPIT LAYOUT MAY HAVE LED TO HIS GETTING BEHIND THE AIRPLANE. PLT SKIPPED A READBACK; THEN OPERATED BY INCORRECT INFO.

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I WAS GOING TO DELIVER A CESSNA 206 TO MIAMI. THE WX S OF MEMPHIS WAS IFR; AND I KNEW I WOULD HAVE TO MAKE AN ILS ON THE WAY DOWN; AND WANTED TO CHK THE EQUIP. I HAD NEVER BEEN IN THE AIRPLANE; SO I DID A VOR CHK; AND A PRACTICE ILS AT MEM BEFORE OPENING MY IFR FLT PLAN. AFTER AN ILS TO A LOW MISSED APCH; RWY 36R; THE TWR TOLD ME TURN TO 030 DEGS AND CONTACT DEP. I HAD EXPECTED A R TURN; BUT I THOUGHT HE SAID 300 DEGS. I STARTED MY TURN; AND TRIED TO CONTACT APCH AND FOUND A PROB WITH THE COM RADIO I WAS USING. I INTENDED TO QUESTION MY ASSIGNED HDG WITH DEP BECAUSE IT WAS TAKING ME THE WRONG WAY FOR MY DEST. WHEN I FINALLY CONTACTED DEP; HE WANTED TO KNOW WHERE I WAS GOING. I DON'T THINK ANY PROB WAS CAUSED BUT IF SOMEONE WAS DEPARTING RWY 36L THERE COULD HAVE BEEN. I AM SURE THE CTLR TOLD ME THE RIGHT WAY TO TURN; AND I MISUNDERSTOOD. I SHOULD HAVE ASKED THE TWR CTLR IF 300 DEGS WAS RIGHT BEFORE I TRIED TO CHANGE TO DEP. I WAS TOO PREOCCUPIED WITH CHKING MY EQUIP. I STILL THINK SAYING 30 OR 300; IS MORE CLR THAN SAYING ZERO THREE ZERO OR THREE ZERO ZERO.