Navigation & Radio at Helena Regional Airport
US
HLN
/
KHLN
Radio Frequencies
14
Navigation Aids
6
Radio Frequencies
A/D
119.500 MHz
APP/DEP
ID: 61293
Ref: 3582
A/D
119.500 MHz
APP/DEP
ID: 61293
Ref: 3582
ATIS
120.400 MHz
ATIS
ID: 61294
Ref: 3582
ATIS
120.400 MHz
ATIS
ID: 61294
Ref: 3582
CTAF
118.300 MHz
CTAF
ID: 61295
Ref: 3582
CTAF
118.300 MHz
CTAF
ID: 61295
Ref: 3582
GND
121.900 MHz
GND
ID: 61296
Ref: 3582
GND
121.900 MHz
GND
ID: 61296
Ref: 3582
OPS
40.650 MHz
ARNG OPS
ID: 61297
Ref: 3582
OPS
40.650 MHz
ARNG OPS
ID: 61297
Ref: 3582
RDO
122.550 MHz
GREAT FALLS RDO
ID: 61298
Ref: 3582
TWR
118.300 MHz
TWR
ID: 61299
Ref: 3582
UNIC
122.950 MHz
UNICOM
ID: 61300
Ref: 3582
UNIC
122.950 MHz
UNICOM
ID: 61300
Ref: 3582
Navigation Aids
CVP
NDB
0.335 MHz
Capitol
Location
Latitude:
46.606701°
Longitude:
-111.936996°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
MEDIUM
Mag Var:
14.065°
ID: 87151
CVP
NDB
0.335 MHz
Capitol
Location
Latitude:
46.606701°
Longitude:
-111.936996°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
MEDIUM
Mag Var:
14.065°
ID: 87151
HAU
NDB
0.386 MHz
Hauser
Location
Latitude:
46.568901°
Longitude:
-111.758003°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
14.012°
ID: 88724
HAU
NDB
0.386 MHz
Hauser
Location
Latitude:
46.568901°
Longitude:
-111.758003°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
14.012°
ID: 88724
HLN
VORTAC
117.700 MHz
Helena
Location
Latitude:
46.606800°
Longitude:
-111.953003°
Elevation:
3823 ft
Additional Info
Usage:
BOTH
Power:
HIGH
Mag Var:
14.067°
DME Information
Channel:
124X
Frequency:
117.700 MHz
ID: 88890
HLN
VORTAC
117.700 MHz
Helena
Location
Latitude:
46.606800°
Longitude:
-111.953003°
Elevation:
3823 ft
Additional Info
Usage:
BOTH
Power:
HIGH
Mag Var:
14.067°
DME Information
Channel:
124X
Frequency:
117.700 MHz
ID: 88890
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