Electronic Flight Bag (EFB)  5-10  Figure 5-28. Prohibited airspace.  Figure 5-27. Restricted airspace.  Figure 5-30. Warning area.  Figure 5-29. Military operations area (MOA).  The electronic flight bag (EFB) is a system for pilots or  crewmembers that provide a variety of electronic display,  content manipulation, and calculation capabilities.  Functions include, but are not limited to, aeronautical  charts, documents, checklists, weight & balance, fuel  calculations, moving maps, and logbooks.  EFB systems may manage information for use in the  cockpit, cabin, and/or in support of ground operations  and planning. The use of an EFB is unique to each aircraft  operator and, depending on the type of operation, EFB use  may require an authorization for use from the FAA issued as  either an operations specification (OpSpec), maintenance  specification (MSpec), or letter of authorization (LOA).  EFBs can be portable [Figure 5-18] or installed [Figure  5-19] in the aircraft. Portable EFBs may have a provision for  securing in the cockpit for use during all phases of flight.  The hardware device, whether it’s an installed avionics  display or portable commercial-off-the-shelf (COTS)  device, commonly referred to as a portable electronic  device (PED), is not considered to be an EFB unless the  hardware device hosts and actively displays either Type  A or B software application(s). A non-inclusive list of Type  A and B software application examples can be found in  appendix 1 and 2 of FAA Advisory Circular (AC) 120-76.  The purpose, technology, and functions for EFB use are  rapidly evolving. New and advanced software applications  and databases beyond traditional flight bag uses continue  to be developed. The FAA has published and continues  to update EFB policy and guidance to educate and assist  aircraft operators interested in using or obtaining an EFB 