DETROIT CLASS B ENTRY WITHOUT CLRNC.

Narrative

I WAS ON A FLT FROM PORT HURON; MI; IN AN AREA EXTREMELY FAMILIAR TO ME. AS I CLRED DETROIT CITY AND WAS NO LONGER IN RADIO CONTACT WITH DETROIT CITY TWR; I ATTEMPTED CONTACT WITH DTW APCH ON 126.85. DETROIT APCH DID NOT CONTACT ME BACK. HAVING MADE THIS PARTICULAR RTE OF FLT DOZENS OF TIMES; I PROCEEDED TO A POINT S OF GROSSE AT 2300 FT (ISLE; MI). WITH VFR RULES IN MIND AND HAVING JUST SEEN A LEARJET BELOW ME; I STARTED A SLOW ASCENT TO 4500 FT AS MY HDG WAS 210 DEGS. AS I REACHED 4300 FT. I NOTICED AN ACR TURBOPROP AT MY 11 O'CLOCK POS ABOUT 3 MI AWAY; ABOVE ME; DSNDING. MY WIFE AND I BOTH COMMENTED ABOUT IT AND IMMEDIATELY BEGAN TO DSND REALIZING WE HAD CLBED PREMATURELY INTO CLASS B AIRSPACE. WE CONFIRMED OUR ERROR ON BOTH THE GPS AND DETROIT SECTIONAL WHICH WAS ON MY WIFE'S LAP OPENED TO THE AIRSPACE JUST S OF CLASS B AIRSPACE. WE DSNDED TO 2500 FT AND ESTIMATE WE WERE IN VIOLATION OF CTLED AIRSPACE FOR APPROX 45 SECONDS TO 2 MINS. AT NO TIME WAS EVASIVE ACTION NECESSARY BY ME. I FEEL THAT THE MAJOR CONTRIBUTING FACTOR TO MY ERROR WAS FAMILIARITY WITH THE RTE OF FLT. THEREFORE; I DID NOT PAY AS CLOSE ATTN TO MY NAVAIDS. OTHER CONTRIBUTING FACTORS COULD BE FLYING MORE TIME IN UNCTLED SPACE AND LESS IN CTLED AIRSPACE SINCE MOVING TO A NEW AREA. IF I WERE TO BE NEAR ANY OTHER UNFAMILIAR AREA NEAR CLASS B AIRSPACE I WOULD BE SUPER CAUTIOUS AND AWARE OF THE EXACT BOUNDARIES.