Is Stratux legal? What it can and can't replace

Short answer: yes. Stratux only listens. It doesn't transmit, and portable ADS-B In receivers don't need certification in the US. It's a situational-awareness tool that works alongside your required equipment.

It doesn't satisfy the ADS-B Out mandate

Stratux is ADS-B In only. If you fly where ADS-B Out is required (14 CFR 91.225), you still need certified ADS-B Out equipment installed in the aircraft.

It isn't certified navigation

Stratux isn't approved as an IFR navigator or primary instrument. Many pilots use it under IFR for supplemental awareness of weather and traffic; just don't rely on it for required navigation.

AHRS is a backup, not an instrument

The optional AHRS gives your EFB an attitude display and synthetic vision. It's a valuable backup for situational awareness, but it isn't certified (no portable AHRS from any maker is). Don't use it as your primary attitude reference.

Traffic and weather have limits

• Traffic: not every aircraft broadcasts ADS-B, and ground-relayed traffic has coverage gaps and delay. Use it to help you see and avoid, not to replace looking outside.
• Weather: FIS-B radar is several minutes old when it arrives. Use it for strategic planning, never to pick a path through thunderstorms.

Panel installs

Wiring a receiver into an aircraft's electrical system or panel is a maintenance question. Talk to your A&P or IA. See Stratux with panel avionics.