Is it compatible with your onboard equipment (external GPS, ADS-B)?

Many pilots connect their tablets to an external receiver to improve accuracy or display traffic.

• External GPS devices (Bad Elf, Dual XGPS, etc.): useful if your device doesn’t have built-in GPS.
• ADS-B/FLARM receivers (SkyEcho, Stratux, PowerFLARM, etc.): display traffic and weather information during flight, but only in compatible apps.
• Simulators: Some apps connect to X-Plane or MSFS for ground training.

Check the list of officially supported devices before making your choice.