Celestial field notes for Earth and sky
Practical field notes for navigating without signal, measuring what is around you, sharing position privately, and exploring the sky with SIMT.
In season
Time-sensitive field notes for events worth planning before they arrive.
Start here
Begin with the complete toolkit, understand offline navigation, then see why one connected spatial app works better than four separate tools.
Core guide
SIMT is an offline-first spatial toolkit that combines planning, tracking, measurement, local sharing, Wear OS sync, advanced GNSS, automation, and astronomy in a single Android experience.
Offline navigation guide
The best offline navigation app is not just one that caches maps. For weak signal, indoor, and underground use, you need fallback behavior, direction tools, target recovery, and workflows that stay useful when standard GPS breaks down.
Why one app beats four
Most people carry four or five separate apps for navigation, measurement, local sharing, and sky tracking. SIMT combines all of those into one offline-first toolkit, and the integrated experience is better than the sum of the parts.
Choose a bearing
Follow the part of the spatial toolkit that matches what you are trying to do.
Compass, targets, offline fallbacks, and route planning when the network is unreliable.
18 guidesIndoor and underground guidance with Track+, checkpoints, motion sensing, and practical recovery flows.
11 guidesLink+, local Wi-Fi location sharing, and nearby-device coordination without cloud dependence.
7 guidesRay+, Measure, Plumb Bob, and on-device tools for distance, area, and alignment work.
5 guidesPlanets, Moon phases, satellites, celestial targets, and the live Orrery experience.
12 guidesPrivate-by-default storage, optional backup, TalkBack support, haptics, and accessible direction finding.
13 guidesEditorial stream
New field notes, product explainers, and practical experiments from across SIMT.
LEO PNT deep dive
Xona has one production-class navigation satellite broadcasting from low Earth orbit and a 258-satellite plan for what comes next. Pulsar is real, ambitious, and not yet a global GPS replacement. Here is what has actually been demonstrated, what remains a target, and why the receiver in your hand matters as much as the spacecraft overhead.
Total solar eclipse 2026
For a couple of minutes on August 12, 2026, the Moon slides dead-centre across the Sun and turns afternoon into an eerie dusk — the first total solar eclipse to reach mainland Europe since 1999. Here is where and when it happens, and how SIMT tells you the exact time and direction to look from your own backyard, with no internet at all.
World Cup 2026 field guide
The whistle blows, the stadium erupts, you turn around — and your friends are gone. Here is how SIMT Link+ reunites your group over the local network or a private offline connection, with secure NFC and QR pairing when the stadium network cannot help.
Travel entertainment
You are 35,000 feet above the Atlantic. Your flight is six hours long. You have already watched the film and the battery on your AirPods is half dead. And then you remember: GeoGuessr costs money and needs WiFi. Here is the free, offline alternative you did not know you had.
Engineering deep dive
Most AR apps lean on ARCore and a certified device list. Iris takes a smarter route: it paints any target onto your live camera with pure mathematics, so augmented reality runs on almost any phone, works offline, and barely touches the battery.
Orrery and time travel
Ever wondered exactly where the planets were the night you were born, or where they will be during the next total eclipse? SIMT's Orrery puts the whole solar system in your hand and lets you drag time backward and forward to find out, entirely offline.
Use cases and feature depth
Use this blog to understand which SIMT feature fits your situation, whether you are trying to find a car underground, coordinate over the same local network, measure a room, follow planets and satellites, or keep your data private by default.
Behind the app
SIMT is founded, designed, and built by Said Elimam — a Paris-based engineer, filmmaker, and music composer. That blend of disciplines is why SIMT pairs precise, offline-first engineering with an interface that aims to feel calm, considered, and genuinely useful in the field.
More about Said ElimamFocused on practical SIMT use cases, feature walkthroughs, and product explainers.
Read about Track+, Link+, Ray+, Wear OS support, astronomy tools, Qibla guidance, backup options, and privacy-first workflows.
