OurAirports has records for 8 different navaids with the identifier "SO". Please select the one you'd like to view.
Angola
310 KHz (SO ... ---)
... ---
Indonesia
255 KHz (SO ... ---)
Mozambique
290 KHz (SO ... ---)
Netherlands
330 KHz (SO ... ---)
Russia
761 KHz (SO ... ---)
Uganda
323 KHz (SO ... ---)
United States
410 KHz (SO ... ---)
Uzbekistan
453 KHz (SO ... ---)