Navigation & Radio at Henry E Rohlsen Airport
VI
STX
/
TISX
Radio Frequencies
9
Navigation Aids
3
Radio Frequencies
A/D
128.650 MHz
SAN JUAN CNTR
ID: 71763
Ref: 6370
ATIS
135.650 MHz
ATIS
ID: 71764
Ref: 6370
ATIS
135.650 MHz
ATIS
ID: 71764
Ref: 6370
CTAF
118.600 MHz
CTAF
ID: 71765
Ref: 6370
GND
121.700 MHz
GND
ID: 71766
Ref: 6370
CTAF
118.600 MHz
CTAF
ID: 71765
Ref: 6370
RDO
108.200 MHz
SAN JUAN RDO
ID: 71767
Ref: 6370
TWR
118.600 MHz
ST CROIX TWR
ID: 71768
Ref: 6370
UNIC
123.000 MHz
UNICOM
ID: 71769
Ref: 6370
Navigation Aids
COY
VOR-DME
108.200 MHz
St Croix
Location
Latitude:
17.734400°
Longitude:
-64.700699°
Elevation:
850 ft
Additional Info
Usage:
BOTH
Power:
MEDIUM
Mag Var:
-13.109°
DME Information
Channel:
019X
Frequency:
108.200 MHz
ID: 86975
COY
VOR-DME
108.200 MHz
St Croix
Location
Latitude:
17.734400°
Longitude:
-64.700699°
Elevation:
850 ft
Additional Info
Usage:
BOTH
Power:
MEDIUM
Mag Var:
-13.109°
DME Information
Channel:
019X
Frequency:
108.200 MHz
ID: 86975
SX
NDB
0.241 MHz
Peste
Location
Latitude:
17.691900°
Longitude:
-64.884697°
Elevation:
N/A ft
Additional Info
Usage:
TERMINAL
Power:
LOW
Mag Var:
-13.054°
ID: 94110
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