CSVF2 protocol servers (see the CSVF2 Radio Modem page), reported by their own operators. Operators with an approved ke9gdp.com account can add one -- click "Add a server", place a pin where it is, and give its frequency; it is listed under your callsign. Heard one on the air? Click its dot and say so, so others know it's still active. Submissions are public and are not verified; treat this as word of mouth, not a guarantee a station is on the air.