Navigation & Radio at Eareckson Air Station
US
SYA
/
PASY
Radio Frequencies
6
Navigation Aids
2
Radio Frequencies
ASOS
135.650 MHz
ASOS
ID: 69683
Ref: 5413
ASOS
135.650 MHz
ASOS
ID: 69683
Ref: 5413
CNTR
119.100 MHz
ANCHORAGE CNTR
ID: 69684
Ref: 5413
CNTR
119.100 MHz
ANCHORAGE CNTR
ID: 69684
Ref: 5413
CTAF
127.200 MHz
CTAF
ID: 69685
Ref: 5413
CTAF
127.200 MHz
CTAF
ID: 69685
Ref: 5413
Navigation Aids
SYA
NDB
0.403 MHz
Shemya
Location
Latitude:
52.722000°
Longitude:
174.059998°
Elevation:
N/A ft
Additional Info
Usage:
BOTH
Power:
MEDIUM
Mag Var:
1.364°
ID: 94121
SYA
VORTAC
109.000 MHz
Shemya
Location
Latitude:
52.718300°
Longitude:
174.061996°
Elevation:
68 ft
Additional Info
Usage:
BOTH
Power:
HIGH
Mag Var:
1.365°
DME Information
Channel:
027X
Frequency:
109.000 MHz
ID: 94120
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