| Class Code | Description | 
                    
                        | AB | Automatic Weather Broadcast | 
                    
                        | DME | UHF standard (TACAN compatible) Distance Measuring Equipment | 
                    
                        | DME(Y) | UHF standard (TACAN compatible) Distance Measuring Equipment that required receivers to be placed in the 'Y' mode to receive DME | 
                    
                        | H | Non-Directional Radio Beacon (NDB), (Homing), power 50 watts to less than 2000 watts (50nm at all altitudes). | 
                    
                        | HH | Non-Directional Radio Beacon (NDB), (Homing), power 2000 watts or more (75nm at all altitudes). | 
                    
                        | H-SAB | Non-Directional Radio Beacom (NDB) providing automatic transcribed weather service. | 
                    
                        | LMM | Compass Locator Station when installed at middle marker site (15nm at all altitudes). | 
                    
                        | LOM | Compass Locator Station when installed at outer marker site (15nm at all altitudes). | 
                    
                        | MH | Non-Directional Radio Beacon (NDB), (Homing), Power less than 50 watts (25nm at all altitudes). | 
                    
                        | S | Simultaneous range homing singal and/or voice. | 
                    
                        | SABH | Non-Directional Radio Beacon (NDB) NOT authorized for IFR or ATC. provides automatic weather broadcasts. | 
                    
                        | TACAN | UHF navigational facility-Omnidirectional Course and Distance information. | 
                    
                        | VOR | VHF navigational facility-Omnidirectional Course only. | 
                    
                        | VOR/DME | Collocated VOR navigational facility and UHF standard Distance Measuring Equipment. | 
                    
                        | VORTAC | Collocated VOR and TACAN navigational facilities. | 
                    
                        | W | Without voice on radio facility frequency. | 
                    
                        | Z | VHF station location marker at a radio facility. |