Name: Flight Scanner (Flight Radar) Free
Rating: 4.7 (69 reviews)
Author: Chemicalz

WARNING: The app is intended only as an in-flight aid and should not be used as a primary information source. If the app contains a barometric altimeter, it will not function in a pressurized aircraft and should not be used in a pressurized aircraft

Free to install, with optional Pro features, Pro can be installed by clicking here to buy the Pro Garmin store version: 
https://apps-developer.garmin.com/apps/21fd8667-f22c-40ad-a0cf-e700eff81040

You can continue to purchase with Keizelpay if you prefer: https://kiezelpay.com/code/?s=53038E7E-4452-D789-B8B2-76DDBDD746B8&dsu=2566227&platform=garmin

Before download - check you can see planes over your location using https://globe.airplanes.live/

Turn your Garmin watch into a live aircraft radar. Flight Scanner is designed for plane spotters, aviation enthusiasts and anyone curious about the aircraft flying overhead.

Free features;
Live radar display with an animated sweep and regularly updated aircraft positions.

Tap aircraft for live details, including callsign, registration, aircraft type, altitude, speed, heading and vertical movement.

Zoom and pan to explore nearby airspace.

Airport markers and compass directions for added orientation.

Military aircraft filter and dedicated helicopter indicators.

Emergency highlighting for aircraft transmitting emergency squawk codes.

Pin aircraft to help keep track of a selected flight.
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Pro features;

Worldwide aircraft search – enter a callsign to locate an aircraft anywhere with available coverage.

Airport Search and runway map - watch planes coming into land.

Examples: TOM45E or KLM76Y. Flight-number search is not currently supported.

Estimated departure and destination information for supported flights. (Experimental, subject to change)

Support continued development of Flight Scanner and future features.

Pro users can keep the application for a longer period before sleeping.
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Aircraft data is provided by airplanes.live. Learn more and contribute to the project at:
https://airplanes.live/

Tips are greatly appreciated via PayPal:
flightscannerapp@gmail.com

Service availability: Flight Scanner relies on internet access, backend infrastructure and third-party aviation-data services. Coverage and availability may change or be interrupted. We will take reasonable steps to maintain the service, but continuous or indefinite availability cannot be guaranteed. If a critical data service is permanently withdrawn and no technically or commercially sustainable alternative is available, some or all live-data features may be reduced or discontinued. This does not affect rights available under applicable consumer law or app-store policies.