In the context of aviation and aerospace, an Automatic Dependent Surveillance (ADS) panel is a component of an aircraft's avionics system that enables the aircraft to transmit its position, altitude, and other relevant data to air traffic control (ATC) and other nearby aircraft. This is done through a system known as Automatic Dependent Surveillance-Broadcast (ADS-B).

The ADS panel is typically a part of the aircraft's cockpit and provides a user interface for the pilot to configure and monitor the ADS-B system. The panel may display information such as:

1. System status: Indicates whether the ADS-B system is operational and transmitting data.
2. Position and altitude: Displays the aircraft's current position, altitude, and velocity.
3. Mode selection: Allows the pilot to select the mode of operation, such as "in" or "out" of ADS-B mode.
4. squawk code: Allows the pilot to enter a unique identification code, which is used to identify the aircraft to ATC.

The ADS panel receives data from various sources, including:

1. GPS: Provides the aircraft's position, altitude, and velocity.
2. Air data computer: Provides air data, such as altitude, airspeed, and heading.
3. Inertial navigation system: Provides aircraft attitude and acceleration data.

The ADS panel then processes this data and transmits it to ATC and other nearby aircraft via a data link, such as a Mode S transponder or a Universal Access Transceiver (UAT). This information is used by ATC to track the aircraft's position and altitude, and to provide separation and other air traffic services.

The ADS panel is an important component of modern avionics systems, as it enables aircraft to participate in ADS-B, which is a key technology for improving air traffic management and reducing the risk of mid-air collisions.