ZET Radar

Zlatko Miletić

About this app

ZET Radar puts Zagreb’s entire tram & bus fleet on your wrist. It is your best companion for public transport. Track any vehicle live in realtime.

ZET Radar works as a standalone app and is available on devices that support Wear OS.

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KEY FEATURES
• Route list – every active tram or bus, automatically sorted by how close it is to you.
 – Pull-to-refresh, or simply reopen the app and the list updates in a second or two.
 – Tap the search icon to filter by route number (e.g. 6, 150…).

• Live map – follow one vehicle in real time.
 – Position refreshes about every 10 seconds via the official ZET GTFS-Realtime feed.
– Locate bus/tram stop stations (direction aware).
 – Vibration + on-screen alert when the vehicle enters proximity radius.
 – Runs as a low-priority foreground service so you can glance away without losing the track.
– Direction-aware tracking: based on the route vehicle trip identifier and utilizing static GTFS data ZET Radar determines the trip direction and displays stops for the correct direction on the map. (NOTE: If static data is outdated this feature may not work. Have patience while waiting the app update.)

• Smart alerts – let the watch notify you when the tram is nearby (no more staring at a timetable which btw we don't have)

• Battery-friendly – GPS is used only when the map is open or an alert is armed. Background polling is network-only.

• Privacy first – location never leaves your watch; no analytics, ads, or accounts.

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DATA SOURCE
Vehicle locations come from ZET’s public GTFS-Realtime endpoint (https://www.zet.hr/gtfs-rt-protobuf).
Feed is currently marked “for testing purposes only” and may occasionally be unavailable or delayed.

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PERMISSIONS
• Notifications – required for proximity alerts and foreground tracking indicator.
• Location – needed to sort vehicles by distance and to know when a tracked vehicle is nearby.
The app remains usable if you deny either permission, but some functions will be limited.

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LICENCES
ZET data © Zagrebački električni tramvaj – Open Licence, Republic of Croatia.

What’s new

Fix:
- new static data (29/4/2026)
- Displaying stops when there is no static shape data for trip (logic for constructing pseudo shape is added)
- Better handling of errors on application load (addressing "error reading ZET response" situation)
- Improved 'first and last stop' logic
UI improvements:
- Splash screen spinner is more fluent