A portable ADS-B receiver is a small battery-powered box that pulls in free weather and nearby traffic from the ADS-B network and sends it over WiFi to your tablet app, like ForeFlight or Garmin Pilot. It is not required equipment, but it is one of the biggest jumps in cockpit awareness you can add without touching the panel, which makes it a favorite upgrade once you start flying cross-country.
Part of our pilot gear guide. New to tablet flying? Start with our GPS and electronic flight bag guide.
Compare receivers side by side: PilotMall’s portable GPS and ADS-B comparison chart lines up weather, traffic, battery life, AHRS, and price across the Stratus, Garmin, and Sentry receivers.
ADS-B In versus ADS-B Out
Two different things share the ADS-B name, and the difference matters:
- ADS-B Out transmits your aircraft’s position to air traffic control and other aircraft. It is installed, certified equipment, and it is required to fly in most controlled airspace.
- ADS-B In receives the weather and traffic picture. A portable receiver gives you ADS-B In only. It does not make your airplane compliant with the ADS-B Out rule, and it does not need to be installed.
So a portable receiver is an awareness tool, not a compliance tool. It rides along in the cockpit and feeds your app.
What you actually get
| Feature | What it gives you |
|---|---|
| Weather (FIS-B) | Free subscription-free weather: radar imagery, METARs, TAFs, TFRs, and more, drawn on your moving map. |
| Traffic (TIS-B) | Nearby aircraft shown on the map so you can back up your visual scan. |
| GPS position | A WAAS GPS source that drives own-ship position in your app. |
| AHRS (some models) | A backup attitude display in the app if the vacuum system or panel fails. |
Is the weather really free?
Yes. The weather broadcast over ADS-B, called FIS-B, is provided by the FAA at no charge, so there is no subscription for it. That is different from SiriusXM aviation weather, which is a separate paid satellite service. A few receivers, like the Garmin GDL 52, can do both the free ADS-B weather and paid SiriusXM in one unit.
Do you need one as a student?
No. Plenty of students train and fly cross-countries without one, and you should still learn to get weather the traditional way and to see and avoid traffic with your eyes. But once you start longer trips, a portable receiver adds a valuable layer of awareness: weather updating in flight and a traffic picture that backs up your scan. If you fly rentals, it moves from airplane to airplane with you.
The main portable options
Three families cover most of the market:
- Appareo Stratus: the Stratus 4 is a dual-band receiver with weather, traffic, AHRS, a replaceable battery, and a color status screen. It pairs with ForeFlight and other apps.
- Garmin GDL series: the GDL 50 delivers ADS-B weather and traffic; the GDL 52 adds SiriusXM and AHRS. Both work smoothly with Garmin Pilot and ForeFlight.
- ForeFlight Sentry: the ForeFlight-branded receiver line, a common pick for pilots who fly with ForeFlight. Compare it against the Stratus and Garmin units on the chart above.
What you'll need
Portable ADS-B receivers from PilotMall.com.
Frequently asked questions
What does a portable ADS-B receiver do?
It receives free ADS-B weather and nearby traffic and sends them over WiFi to a tablet app like ForeFlight or Garmin Pilot, and it usually provides a GPS position source. Some models add a backup attitude display.
Do I need a portable ADS-B receiver as a student pilot?
No. It is an awareness upgrade, not required equipment, and it does not make your aircraft ADS-B Out compliant. Many students fly without one, but it is a popular addition for cross-country flying.
What is the difference between ADS-B In and ADS-B Out?
ADS-B Out is installed, certified equipment that transmits your position and is required in most controlled airspace. ADS-B In receives weather and traffic, which is what a portable receiver provides.
Is ADS-B weather free?
Yes. The ADS-B weather broadcast, called FIS-B, is provided free by the FAA with no subscription. SiriusXM aviation weather is a separate paid service that some receivers can also display.