Coordination for teams in the field
Situational awareness for teams.
The whole team's positions, messages, alerts and incidents on one shared map, in real time. With a backup network of its own that keeps working when phone networks or the power go down.
- Free software
- End-to-end encrypted
- No accounts
Photo: Maël Balland
Capabilities
A common operating picture.
Every member sees the same thing, on the same map, at the same time: where the team is, what is happening and what has been decided.
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Team tracking
Every member's position in real time. Each person decides when to share it, pause it or hide it.
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SOS with acknowledgement
A call for help, with its type and position, reaches the whole team at once. Whoever sent it sees who has received it.
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Team messaging
Short messages, built to travel over radio too. Whatever is written without coverage goes out as soon as there is a link.
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Coordination alerts
Coordinators send alerts by level. Critical ones stay on screen until every member acknowledges them.
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Terrain marking
Sectors, meeting points, hazards and routes, shared with and editable by the whole team.
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Offline maps
The map of the area of operations, downloaded in advance. Still there when the network is not.
Connectivity
Keeps working when the network goes down.
The same app and the same data, whatever infrastructure is available. Tesel uses whichever link it finds and syncs everything when the connection returns.
Internet
With mobile data or wifi, through Tesel's server or your own. The server relays the encrypted data without being able to read it.
LoRa radio mesh
Each phone pairs over Bluetooth with a pocket radio. The radios relay messages between them over kilometres, with no phone masts involved.
Command post
A computer sets up a local wifi network in the area of operations and acts as the team's server. It can bridge to the radio mesh and, once it is back online, syncs with the rest of the organisation.
Who it is for
For teams that work in the field.
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Civil protection
Volunteer groups and local services, in emergencies and at planned events.
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Search and rescue
Sector searches, with the ground divided up and every team in view.
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NGOs and humanitarian aid
Teams deployed where infrastructure fails or does not exist.
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Events and operations
Security, medical and staff at races, festivals and large gatherings.
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Mountains and expeditions
Groups beyond coverage who need to know about each other.
Deployment
Operational in three steps.
No installs, no sign-ups. What takes time is practice, and that is best done early.
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Create the team
The coordinator creates the group and invites with a link or a QR code. Each member only picks a name.
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Prepare the area
Download the map of the area of operations over wifi and, if you use radios, pair them with your phones.
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Run a drill
Practise positions, SOS and alerts on a quiet day. An emergency is not the time to learn a new tool.
Start now
It runs in the browser.
On any phone, tablet or computer, at tesel.eu/app. No app stores, and it updates itself.
Open TeselInstall it as an app
- Android, with Chrome: menu ⋮, “Add to Home screen”.
- iPhone, with Safari: Share button, “Add to Home Screen”.
- Computer, with Chrome or Edge: the install icon in the address bar.
Native apps for Android and iOS are in development: background location, alerts with the app closed, and radio on iPhone too.
Security
Private by design.
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No accounts
No email, no phone number, no password. Each member only picks a name.
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End-to-end encryption
Only the team holds the key. Neither the server nor the post can read anything.
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No tracking
No ads, no analytics and no logs of who connects.
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Open source
European EUPL licence. Anyone can audit it or run their own server.
Tesel does not replace 112. If you can call, call.
Questions
Before you deploy it.
Does it cost anything?
No, and it will not. Only the radios, if you decide to use them.
Do we need radios?
No. With coverage, Tesel needs nothing else. Radios and the command post are for when there is none.
Which radios are supported?
LoRa radios running MeshCore with its “Companion Bluetooth” firmware. We are validating them in the field and will publish recommended models here.
Does it work on iPhone?
Yes, over the internet or through a command post. Safari does not allow Bluetooth radios; the native app will.
Can we run our own server?
Yes. The server is free software and runs on a modest computer, in the cloud, or as an offline command post.
Who is behind it?
A citizen-led free software project, under the European EUPL-1.2 licence.