PLT OF AS55 EXPERIENCES NMAC NEAR BVI; AFTER AN UNAUTH ENTRY OF CLASS D AIRSPACE.

Narrative

I WAS PIC OF A COMMERCIAL HELI FLT NEAR ZZZ1. APCHING ZZZ1'S CLASS B AIRSPACE SWITCHED TO PRE-DESIGNATED DISCRETE XPONDER CODE AND TUNED APCH FOR MONITORING. KNOWING I WAS APCHING ZZZ1 FROM THE W; I SWITCHED THE GPS MODE TO MAP IN ORDER TO SEE THE PROX OF THE ACFT TO CLASS D AIRSPACE AT ZZZ. THE MAP MODE WAS NOT CURRENTLY SET-UP TO SHOW ARPTS SO I HAD TO SELECT THAT OPTION. AT THE SAME TIME; COMPANY DISPATCH PROVIDED UPDATED LNDG ZONE COORDINATES; WHICH THE PLT ENTERED. I DID NOT SEE ZZZ ON THE GPS BECAUSE OF ENTERING THE NEW COORDINATES. SHOWING APPROX 6 MI TO THE SCENE; I TUNED ACFT FM RADIO TO THE GND FREQ FOR A LNDG ZONE BRIEF WITH THE GND UNIT. SEEING AN ARPT AND REALIZING PROX TO ZZZ I QUICKLY SWITCHED TO CTAF TO CONTACT TWR. SEVERAL OTHER ACFT WERE TALKING WITH TWR AND I WAS UNABLE TO CONTACT TWR FOR IMMEDIATE CLRNC. CONCURRENTLY; GND UNIT WAS GIVING LNDG ZONE DESCRIPTION TO AIRCREW AND I WAS VISUALLY LOOKING OUTSIDE FOR LNDG ZONE. AT THE TIME I SPOTTED AN AIRPLANE TURNING ON AN EXTENDED R BASE FOR RWY XX AND TURNED SW TO AVOID. AT THIS TIME I WAS SPEAKING WITH ZZZ TWR GIVING POS RPT AND MISSION INFO. CLRNC WAS GIVEN AND CONTINUED TO THE LNDG ZONE. CAUSAL FACTORS LEADING UP TO THIS INCIDENT: I WAS WORKING AT A DIFFERENT HOME BASE FOR THE FIRST TIME; TASK SATURATION INFLT; LOSS OF SITUATIONAL AWARENESS. A HIGHER LEVEL OF PLANNING PRIOR TO DEPARTING; DELEGATING MORE DUTIES TO AIRCREW; AND CONTACTING ZZZ SOONER WOULD HAVE HELPED AVOID THIS SIT. I DEBRIEFED THE AIRCREW DURING POSTFLT.