FlightAware Discussions

WHat happend to MLAT

I upgraded to 3.8.1 and have Green MLAT but Ive lost all my MLAT flights and my flight count has dropped in Half.

Wha Happen?

On My ADSB Page I have

Multilateration (MLAT): Supported / Enabled (synchronized with 191 nearby receivers)

But map shows no MLAT flights.

I did a check on most of your nearby sites and they are all reporting no MLAT flights.
They are using other versions of PiAware.
Maybe it is because of the virus thing and there are no MLAT flights at all.

No problems with MLAT here. Upgraded a few days ago.

In US it’s mandatory for most of the commercial planes to have ADS-B. So no MLAT is needed for those.
With the current situation, probably most of those exceptions are grounded.
https://www.faa.gov/nextgen/programs/adsb/faq/#g2

The FAA requires ADS-B Out capability in the continental United States, in the ADS-B rule airspace designated by FAR 91.225:

Class A, B, and C airspace;
Class E airspace at or above 10,000 feet msl, excluding airspace at and below 2,500 feet agl;
Within 30 nautical miles of a Class B primary airport (the Mode C veil);
Above the ceiling and within the lateral boundaries of Class B or Class C airspace up to 10,000 feet;
Class E airspace over the Gulf of Mexico, at and above 3,000 feet msl, within 12 nm of the U.S. coast.