Navigation & Radio at Chicago O'Hare International Airport
US
ORD
/
KORD
Radio Frequencies
17
Navigation Aids
11
Radio Frequencies
APP
119.000 MHz
APP
ID: 70184
Ref: 3754
ASOS
135.400 MHz
ASOS
ID: 70185
Ref: 3754
ASOS
135.400 MHz
ASOS
ID: 70185
Ref: 3754
ATIS
135.400 MHz
ATIS
ID: 70186
Ref: 3754
ATIS
135.400 MHz
ATIS
ID: 70186
Ref: 3754
CLD
121.600 MHz
CLNC DEL
ID: 70187
Ref: 3754
CLD
121.600 MHz
CLNC DEL
ID: 70187
Ref: 3754
DEP
125.000 MHz
DEP
ID: 70188
Ref: 3754
DEP
125.000 MHz
DEP
ID: 70188
Ref: 3754
GND
121.675 MHz
GND
ID: 70189
Ref: 3754
GND
121.675 MHz
GND
ID: 70189
Ref: 3754
PTD
126.200 MHz
PTD
ID: 70190
Ref: 3754
PTD
126.200 MHz
PTD
ID: 70190
Ref: 3754
TWR
126.900 MHz
TWR
ID: 70191
Ref: 3754
TWR
126.900 MHz
TWR
ID: 70191
Ref: 3754
UNIC
122.950 MHz
UNICOM
ID: 70192
Ref: 3754
UNIC
122.950 MHz
UNICOM
ID: 70192
Ref: 3754
Navigation Aids
GCO
DME
108.250 MHz
Chicago O'Hare
Location
Latitude:
41.994000°
Longitude:
-87.902000°
Elevation:
650 ft
Additional Info
Usage:
TERMINAL
Power:
MEDIUM
Mag Var:
°
DME Information
Channel:
086X
Frequency:
108.250 MHz
ID: 92084
GCO
DME
108.250 MHz
Chicago O'Hare
Location
Latitude:
41.994000°
Longitude:
-87.902000°
Elevation:
650 ft
Additional Info
Usage:
TERMINAL
Power:
MEDIUM
Mag Var:
°
DME Information
Channel:
086X
Frequency:
108.250 MHz
ID: 92084
IA
NDB
0.414 MHz
Taffs
Location
Latitude:
41.984299°
Longitude:
-87.789001°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
-3.000°
ID: 89112
IA
NDB
0.414 MHz
Taffs
Location
Latitude:
41.984299°
Longitude:
-87.789001°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
-3.000°
ID: 89112
ID
NDB
0.385 MHz
Inddy
Location
Latitude:
41.904900°
Longitude:
-87.806900°
Elevation:
N/A ft
Additional Info
Usage:
LO
Power:
LOW
Mag Var:
-2.580°
ID: 89150
ID
NDB
0.385 MHz
Inddy
Location
Latitude:
41.904900°
Longitude:
-87.806900°
Elevation:
N/A ft
Additional Info
Usage:
LO
Power:
LOW
Mag Var:
-2.580°
ID: 89150
ME
NDB
0.350 MHz
Deana
Location
Latitude:
41.967800°
Longitude:
-88.026703°
Elevation:
699 ft
Additional Info
Usage:
TERMINAL
Power:
MEDIUM
Mag Var:
-2.475°
ID: 90856
OH
NDB
0.368 MHz
Leama
Location
Latitude:
42.069199°
Longitude:
-87.990898°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
-2.506°
ID: 91937
OH
NDB
0.368 MHz
Leama
Location
Latitude:
42.069199°
Longitude:
-87.990898°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
-2.506°
ID: 91937
OR
NDB
0.394 MHz
Chstr
Location
Latitude:
42.055901°
Longitude:
-88.007797°
Elevation:
N/A ft
Additional Info
Usage:
LO
Power:
LOW
Mag Var:
-2.496°
ID: 92077
OR
NDB
0.394 MHz
Chstr
Location
Latitude:
42.055901°
Longitude:
-88.007797°
Elevation:
N/A ft
Additional Info
Usage:
LO
Power:
LOW
Mag Var:
-2.496°
ID: 92077
Understanding Airport Navigation & Radio Communications
Radio Frequencies in Aviation
Radio frequencies are essential for communication between aircraft, air traffic control, and ground services. Here are the common types:
Common Frequency Types
- ATIS (Automatic Terminal Information Service): Continuous broadcast of airport conditions
- Ground: Communication with ground control for taxi instructions
- Tower: Communication with air traffic control tower
- Approach/Departure: Handling arriving and departing aircraft
- UNICOM/CTAF: Used at airports without control towers
Frequency Ranges
- VHF Band: 118.000 - 136.975 MHz
- Emergency: 121.5 MHz (International emergency frequency)
- Ground Control: Usually 121.6 - 121.9 MHz
- ATIS: Usually 108 - 118 MHz
- UNICOM: Typically 122.8 MHz (uncontrolled airports)
Navigation Aids (Navaids)
Navigation aids are electronic systems that help pilots determine their position and navigate safely. Here are the main types:
Types of Navaids
- VOR (VHF Omnidirectional Range): Provides bearing information to aircraft
- DME (Distance Measuring Equipment): Gives slant-range distance to the station
- NDB (Non-Directional Beacon): Simple radio beacon for basic navigation
- TACAN (Tactical Air Navigation): Military version of VOR/DME
- VORTAC: Combined VOR and TACAN facility
Usage Types & Power Levels
- HI: High altitude navigation
- LO: Low altitude navigation
- TERM: Terminal area navigation
- Power Levels: HIGH, MEDIUM, LOW (affects range)
- RNAV: Area navigation capability
Important Notes
- Always verify frequencies and navaid status in current aviation publications
- Magnetic variation changes over time and should be considered when using navaids
- Some navaids may be out of service or have limited hours of operation
- DME distances are slant-range and may differ from actual ground distance