Coverage note: Military aircraft appear on this map because they are required to broadcast ADS-B transponder signals when operating in civilian-controlled airspace — this is an ICAO safety requirement to prevent midair collisions, not voluntary intelligence sharing. Most NATO and allied air forces (U.S., UK, France, Germany, Brazil, India, Australia, and others) comply when transiting shared airspace. Russia, China, Iran, and North Korea generally do not — their military aircraft operate in sovereign or military-controlled airspace where transponders are not required, and community ADS-B receiver networks have minimal coverage in those regions. Similarly, naval AIS tracking depends on transponder use that warships can disable during operations. TFR data is FAA only (U.S. airspace). Absence of data in a region does not mean absence of military activity.