A TAXIING KING AIR CPR ACFT; WITH THE FO BUSY PROGRAMMING THE GPS; CROSSES AN ACTIVE RWY WITHOUT CLRNC AT CYYZ; ON.

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WE WERE CLRED BY TORONTO GND (121.65) TO TAXI FROM THE GA AREA VIA TXWY J TO TXWY B AND THEN TO HOLD SHORT OF RWY 5. DURING TAXI ON TXWY J MY COPLT WAS TALKING WITH CLRNC DELIVERY TO VERIFY OUR ROUTING AND WORKING ON PROGRAMMING OUR GPS. USING SEVERAL CHARTS; I MADE THE R TURN FROM TXWY J TO TXWY B AND FAILED TO RECOGNIZE THE HOLD SHORT LINE FOR RWY 5; WHICH WAS THE LNDG RWY. TXWY B CROSSES RWY 5 CLOSE TO THE DEP END. AS WE TAXIED ACROSS THE RWY; I LOOKED OUT OF THE R COCKPIT WINDOW AND REALIZED THAT WE WERE ON THE RWY; AS WE WERE ALREADY IN THE MIDDLE OF THE RWY; WE CONTINUED ACROSS. AS A CREW WE DID NOT PERFORM WELL IN THIS PARTICULAR SIT; AND THE POOR WX CONDITIONS AND OUR UNFAMILIARITY WITH TORONTO/CANADA ADDED TO THE PROB. TO AVOID THIS IN THE FUTURE; WE WILL NOT MOVE THE AIRPLANE/REQUEST TAXI CLRNC UNTIL OUR ROUTING IS VERIFIED AND PROGRAMMED INTO OUR GPS. THIS WAY WE CAN BOTH MONITOR OUR TAXI. ATTRIBUTING TO THE MISTAKE; AS STATED EARLIER WAS POOR VISIBILITY AND RAIN AT YYZ. WHEN TAXIING ON TXWY J IN THE L SEAT OF THE AIRPLANE; THE RWY 5 IS ON ONES 'BLIND' SIDE; AND AFTER TURNING ONTO TXWY B; VERY LITTLE DISTANCE OF 'RWY 5' REMAINS ON ONE'S L. I FEEL CONFIDENT I WOULD HAVE RECOGNIZED THE RWY IF WE HAD CROSSED CLOSER TO THE MIDDLE; RATHER THAN AT THE DEP END. FINALLY WE WERE BOTH UNFAMILIAR WITH THE 'ACR PLT' CHART FORMAT; AND WE FOUND THEM MORE DIFFICULT TO READ THAN THE CHARTS WE NORMALLY USE. AFTER THE FLT I CALLED THE MGR AT THE YYZ TWR TO EXPLAIN. SUPPLEMENTAL INFO FROM ACN 473628: ALL OF MY ATTN WAS INSIDE. I DID NOT SEE THE INCIDENT HAPPEN BUT WHEN I LOOKED UP WE WERE IN THE MIDDLE OF THE RWY. WE WERE ASKED BY THE GND CTLR IF WE KNEW THAT WE CROSSED RWY 5 WITHOUT PERMISSION. I REPLIED 'AFFIRMATIVE' AND THE CTLR SAID 'THANK YOU.'