Telemetry File Previews
ShippedBrowse Your Flight Files Like Photos
AltosUI registers as the handler for .telem files on your device. That means your telemetry recordings show up in the Files app with custom thumbnails and rich previews — you can browse your flight library without even opening AltosUI.
What You See
Custom Thumbnails — Every .telem file displays with a distinctive Altus Metrum icon in the Files app, so you can spot your telemetry files instantly among other documents. No more guessing which files are flight data.
Quick Look Previews — Press and hold a .telem file (or tap the preview button) and you get a formatted summary of that flight without launching the app:
- Date flown — extracted from the filename
- Rocket serial number — which flight computer recorded the data
- Callsign — matched from your tracker database
- Device type — TeleMega, TeleMetrum, TeleMini, or TeleGPS
- Max altitude — peak height from that flight
- Max speed — peak velocity recorded
The preview pulls metadata from your tracker history, so flights you've already received telemetry for show the richest detail.
How to Use It
Just open the Files app and navigate to the AltosUI folder. Your .telem files are there, each with a thumbnail icon. Tap any file to preview it, or long-press for Quick Look.
You can also share .telem files via AirDrop, email, or any share target — they carry the custom icon and preview metadata with them.
Tip: AltosUI automatically saves telemetry to .telem files during live flights. The filename encodes the date, rocket serial, flight number, and ground station serial, so files sort chronologically and are easy to identify.
When It Works Best
After a day of flying, when you want to review which flights were recorded. The previews let you quickly scan through your flight library and find the one you're looking for — by date, by rocket, or by peak altitude — without loading each file individually.
It's also useful when sharing flights with club members. Send a .telem file and the recipient sees the flight summary right in their share sheet.
What You Need
.telemfiles saved on the device (created automatically during live flights, or copied via Files/AirDrop)- For the richest previews, the matching tracker data should be in the app's history (received during a live telemetry session)