The captain's failure to maintain clearance from a parked airplane awaiting for a gate. A contributing factor was that taxi procedures were not issued by ground control to advise the captain that the ramp area where he was taxing was designated as a non-movement area and not under the tower's control. Another factor was that company notices to airmen (NOTAMS) were not issued to advise their pilots that tarmac markings in that particular ramp area were not accurate, and that the area was a non-movement area not under the control of the tower.