This document recommends criteria for the control and display of communications and navigation equipment on the flight deck. The equipment includes: a. Communications: Ultra High Frequency (UHF), Very High Frequency (VHF), and High Frequency (HF) Radios, Cabin/Service Interphones, Public Address (PA), Select Call (SELCAL), Call Select (CALSEL), Satellite Communications (SATCOM), b. Navigation: Very High Frequency Omnidirectional Range (VOR), Tactical Air Navigation (TACAN), Automatic Direction Finder (ADF), Distance Measuring Equipment (DME), Instrument Landing System (ILS), Markers (MKR), Omega, Very Low Frequency (VLF), Inertial Navigation Systems (INS), Inertial Reference Systems (IRS), Satellite Navigation (SATNAV), Low Range Radio Altimeter (LRRA).