Updated 16 Jun 2016 - Air Transportation Companies under long term charter are required to have an active compliant aircraft-tracking unit that transmits real-time automatic geospatial tracking flight data with event logging capabilities to the United Nations Aviation Global Satellite Tracking Service provider Skytrac Systems Ltd.  Please review the attached.  Please review the attached document for a detailed description of the requirement (Revision No.1 posted 16 June 2016).