Plane Finder explained: features, AR view and value for plane spotters

A bright dot drifts over your spot at eleven kilometers altitude, a thin contrail behind it. An Airbus? A Boeing? Where is it headed? This is exactly the question Plane Finder became known for: you hold your smartphone up to the sky, and the app tells you what is up there. But Plane Finder is more than an AR gimmick. The service is one of the oldest flight trackers around, has its own receiver network and a playback archive that reaches far back. This article puts in context what Plane Finder is, how the AR view works and when the service really pays off for plane spotters. If you’re looking for step-by-step operation, you’ll find it in the Plane Finder overview with guide.

The short answer

Plane Finder is a full-fledged flight tracker with a focus on visualization. The live map, flight details, airport boards, filters and alerts are familiar in similar form from other services. Plane Finder stands apart through three things: the AR view in the camera image, the 3D view of the airspace and playback to 2011. For spotters, the service is therefore especially interesting if you want to identify many overflights, like to label your map individually or want to match sightings cleanly after the fact. As a sole tracker, it is enough for many, but it often plays to its strengths as a second service alongside an all-rounder.

Who is behind Plane Finder

The operator is Pinkfroot Ltd., a private company based in Southampton on England’s south coast. Plane Finder launched in 2009, at a time when smartphones were only just becoming a platform for aviation apps. There used to be separate app variants with augmented reality and 3D display; today the AR mode and 3D view are in the main app. Besides the apps, the map along with the database is also available in the browser.

That Plane Finder is no niche product is also shown by the fact that British and international media have repeatedly used the service’s data to reconstruct flight paths after incidents. More important for you as a spotter: the service is commercial, funded by advertising and subscriptions, and has its own network of volunteer receivers.

Where the data comes from

What appears on the map is only ever as good as the source behind it. Plane Finder combines four data streams:

Source	What it provides	Relevance for spotters
ADS-B	Callsign, position, altitude and speed straight from the aircraft, received by ground stations	Main source; densely covered in Europe
MLAT	Position from time-difference measurements across several receivers, for aircraft without an ADS-B position	important for older transponders, needs many stations
FAA feed	Data for airspace over the US and Canada as well as adjacent oceanic areas	fills gaps in North America
FLARM	central feed for light aircraft and gliders	exciting at gliding sites and small airfields

On top of the pure position data, Plane Finder adds registrations, departure and destination airports as well as photos from its own databases. This matching is the real added value for spotters, because the aircraft itself only transmits its technical address and callsign via ADS-B. What distinguishes a callsign from a flight number is explained in Callsign and flight number.

For MLAT, the rule is: Europe is largely covered, North America only in parts – the FAA feed steps in there. How multilateration works exactly and why it often fails close to the ground can be read in MLAT and multilateration explained. The basics of the technology are summed up in Flight tracking with ADS-B for spotters.

The AR view: how it works technically

Augmented reality sounds high-tech, but the principle is easy to follow. The app needs three pieces of information:

1. Where you stand: This is provided by your smartphone’s GPS receiver.
2. Where you are looking: Compass, acceleration and orientation sensors determine the heading and tilt of the device.
3. Where the aircraft are: The live positions including altitude come from Plane Finder’s data network.

From these values, the app calculates an angle and an elevation above the horizon for every aircraft in the area. If an aircraft lies in the camera’s field of view, an info card with the key data appears at the matching spot. You don’t even have to see the aircraft for this – even behind a cloud or in haze, the overlay shows where it currently is.

Where the AR view has its strengths

• Overflights at cruising altitude: With the naked eye, a jet at high altitude is hard to identify. The overlay tells you airline, type and route, and thus whether reaching for the long telephoto is worth it.
• Crowded airspace: When arrivals, departures and overflights cross, one sweep tells you which dot is which aircraft.
• New spots: At an unfamiliar airport, AR helps you get a feel for the approach direction and traffic flow.
• Fellow spotters and family: For beginners, there is hardly a more vivid way to understand air traffic.

Where it reaches its limits

• Sensor errors: An uncalibrated compass or a metal fence right next to you shifts the overlays. Calibrating via the system settings or a figure-eight motion with the phone usually helps.
• Delay: Position data never arrives in real time. With a jet at ten kilometers altitude, you hardly notice, but with a landing on short final, the map quickly sits a bit off from the aircraft.
• Ground traffic: For taxi movements, the map is usually more helpful than the camera.
• Battery: Camera, GPS, sensors and mobile data at the same time cost noticeable energy. On long days, a power bank belongs in your bag.

How much buffer you should generally allow for position and time information is described in How accurate is the arrival time on a flight tracker?.

The other features at a glance

Apart from AR, Plane Finder covers what you expect from a modern flight tracker. The table shows which feature helps you as a spotter and with what.

Feature	What it does	Use at the spot
Live map	worldwide traffic with several map styles, including satellite imagery	watch the approach line, explore new airports
Labels	customizable labeling right at the aircraft symbol	registration, type and airline at a glance, without tapping every symbol
Filters	tidy up the map by your own criteria	show only your airport or certain types
Airport boards	arrivals and departures for many airports	check the list for special visitors in the morning
Alerts	notification when a specific aircraft approaches	don’t miss your wish-list aircraft
3D view	airspace from any perspective over satellite imagery	estimate how an approach passes your vantage point
Playback	replay past traffic, back to 2011	match sightings after the fact
VFR charts	visual flight charts from British air traffic control NATS as a layer	place light aircraft traffic in Britain

The labels in particular are underrated. If you set them to registration, type and airline, you read the approach line like a list. What symbols, colors and data fields on flight tracker maps mean is explained in Flight tracker symbols and colors. How to set up alerts across services in a sensible way is shown in Setting up notifications for aircraft, types and airlines.

Playback: the tool for review

For spotters, playback is perhaps the most useful feature after the day is done. By its own account, Plane Finder was the first major flight tracker to introduce a replay, and the archive goes back to 2011. You choose a place and time and see what was flying over your spot back then. That way you find out which aircraft is in a photo with an illegible registration, or check which runway direction was in use on a given day. The systematic comparison is described in Matching sightings with ADS-B logs and flight tracker history; more tricks are in Working out an illegible registration.

Free, Premium and the feeder route

Plane Finder can be used free of charge as an app and is ad-supported. Plane Finder Premium, offered as a subscription, unlocks additional features. These include the 3D view and weather on the map, among others. One subscription can be used on several devices with one account, including in the browser. Prices and terms change regularly and differ by store and country – so check directly in the App Store or on Google Play before you sign up. A trial period is best used deliberately at your home spot.

The cheapest way to get Premium is your own receiver. With the Plane Finder ADS-B Client, you share your station’s data with the network. The client runs on Linux, macOS and Windows and works with the typical setup of Raspberry Pi, SDR stick and 1090 MHz antenna. In return, data contributors can request free Premium access from the Plane Finder team. Because the client can run alongside other feeders, one antenna supplies several services at once.

How the setup works in practice is covered in the Plane Finder overview. The hardware part is explained in Building your own ADS-B receiver, running in parallel in Feeding multiple networks with Ultrafeeder. What the other networks offer their feeders is compared in What feeders get in return. Beforehand, it’s worth a look at the legal situation of ADS-B reception.

Plane Finder compared

The big flight trackers rely on similar technology. The differences lie in focus, operation and data policy.

Criterion	Plane Finder	Flightradar24	AirNav Radar	ADS-B Exchange
Focus	AR, 3D, labels, playback	all-rounder with very wide reach	many filters and statistics	community data as unfiltered as possible
AR view	trademark	available	not a focus	not a focus
Model	free plus Premium subscription	free plus several subscription tiers	free plus several subscription tiers	no classic tiered subscription
Feeder benefit	Premium access	upgraded account	Business account	open data, station statistics

The table describes tendencies, not complete feature lists. You’ll find the head-to-head matchups of the big names in Flightradar24 vs. FlightAware and RadarBox explained, and the overall overview in the Flight tracker apps comparison. If you’re looking for military or government traffic, see ADS-B Exchange explained and Tracking military aircraft online.

How to use Plane Finder when spotting

A typical day shows what this looks like in everyday use – for example at Myrtle Avenue at London Heathrow Airport, where approaches come low over the houses and through traffic crosses above, or at the Munich Airport visitors’ hill at Munich Airport.

Without mobile data, no flight tracker app helps you. You become independent with mobile ADS-B reception at the spot. And if an aircraft is missing from the map entirely, it’s usually due to coverage or blocking – the causes are explained in Why an aircraft doesn’t show up on the flight tracker.

Which free options exist otherwise is shown in Free flight tracker apps. Which apps beyond that belong in a spotter’s basic kit is sorted out in the Plane spotting apps comparison.

Conclusion

Plane Finder is one of the pioneers among flight trackers and has carved out its own niche with AR and 3D view. The data base of ADS-B, MLAT, FAA and FLARM feeds is solid, and the freely configurable labels and playback to 2011 are real spotter tools. The AR view shines with overflights at high altitude; for fast movements right at the airport, the map is usually more accurate. Premium is worth it if you regularly use 3D and weather – or you get it as a feeder with your own receiver.