UNAUTH PENETRATION OF CLASS B AIRSPACE.

Narrative

WE FLEW INTO CALDWELL; NJ ON A 135 PAX FLT. OUR NEXT LEG WAS TO BE A PART 91 REPOSITIONING FLT TO LAGUARDIA. DURING THE APCH TO CALDWELL; THE CAPT WENT ON ANOTHER RADIO TO FACILITATE OUR TRIP TO LAGUARDIA; OSTENSIBLY TO OBTAIN A SQUAWK CODE. I CONTINUED TALKING TO THE TWR. AFTER LNDG; WE DROPPED THE PAX OFF AT CALDWELL; AND DIDN'T SHUT 1 ENG DOWN. WE TAXIED FOR TKOF ON RWY 22 AT CALDWELL; AFTER SWITCHING SEATS. (I WAS IN THE L SEAT; OR PF) PNF HAD A NEW YORK AREA CHART; AND HAD OBTAINED A FREQ FOR NEW YORK APCH FROM THE TWR. HE ALSO REQUESTED AND OBTAINED A L TURNOUT FROM CALDWELL; TO THE E. I TOOK A LOOK AT THE MOVING MAP; SAW THE FLOOR OF THE CLASS B (UNDER CDW) WAS 3000 FT MSL; AND TOOK OFF. PNF WENT OVER TO THE APCH FREQ; BUT COULDN'T RAISE ANYBODY. SHORTLY AFTER; WHILE CLBING THROUGH 2000 FT MSL; I LOOKED AT THE MOVING MAP; WHICH SHOWED THE FLOOR OF NEW YORK'S CLASS B TO BE 1800 FT MSL!!! I DSNDED TO 1700 FT MSL; AND WHEN PNF MANAGED TO GET A CORRECT FREQ; WE WERE TOLD TO MAKE AN IMMEDIATE 180 DEG TURN. WE WERE THEN CLRED INTO THE CLASS B; AND VECTORED TO LAGUARDIA WITHOUT INCIDENT. THE PROB AROSE FROM A LACK OF COM; OUR HASTE TO GET TO LAGUARDIA; AND A LACK OF A THOROUGH BRIEFING BEFORE TKOF. I ASSUMED THAT THE PNF KNEW WHAT WE WERE HDG FOR; AND WOULD OBTAIN THE PROPER CLRNC. I ALSO SHOULD HAVE HAD A BACKUP PLAN; IF SUCH A CLRNC WAS NOT OBTAINED. HE ASSUMED I WOULD KEEP US CLR OF THE AIRSPACE AHEAD. WE RUSHED THROUGH THE PRETKOF BRIEFING; DURING WHICH WE SHOULD HAVE HAD A RTE AND BACKUP PLAN AGREED UPON; A R TURN AFTER TKOF WOULD HAVE GIVEN US MORE TIME TO ASSURE PROPER COMS AND CLRNCS. THE BAD FREQ DIDN'T HELP; EITHER. IN THE FUTURE; A THOROUGH BRIEFING BEFORE DEP WILL PREVENT THIS FROM HAPPENING AGAIN.