A field journal that speaks GeoJSON

Field notes that
are real GeoJSON.

Walk somewhere worth remembering and tap once — signal or no signal. GeoJSONic captures the moment and the place — GPS, elevation, weather, the name of where you stood — and writes it as honest GeoJSON you actually own.

Available soon on the App Store See how it works ↓

GPS 36.8689, −94.3683

Elevation 342.4 m

Accuracy ±4.9 m

Heading 271° W

Place Neosho, MO

Weather 14.2°C · Partly Cloudy

No signal? No problem.

Built for where the
map runs out.

Most journaling apps quietly assume you're online — they stall, spin on a sync, or drop what you wrote the moment the bars disappear. GeoJSONic is built the other way around: capturing a note never needs a connection — your words, GPS fix, and elevation are saved on the spot, anywhere on Earth. And the map keeps working offline, too, across every place you've already pulled up.

GPS without a tower

Positioning is satellite-based — it needs no cell tower, no Wi-Fi, not a single bar. Your exact coordinates and elevation are captured deep in the backcountry, on a plane, or abroad with data switched off.

Saved on the spot

Every note is written straight to your device the instant you tap. No spinner, no upload queue, no account to log into. Nothing waits on a connection, and nothing can be lost to one.

Graceful when connected

The two online touches — the weather and the place name — fill in when you have signal and quietly sit out when you don't. The note saves cleanly either way.

One tap

Capture the place, not just the moment

A single tap grabs your GPS fix, elevation, accuracy, speed, and heading — then quietly enriches it with the place name, your timezone, and the weather right where you stood.

RFC 7946

Every note is real GeoJSON

Notes are stored as honest GeoJSON Features on disk — not a proprietary blob. Import and export losslessly. Open them in any GIS tool. Your journal is yours to keep.

Write freely

Markdown, tags, and photos

Write in Markdown, file with tags, attach photos. Location is always optional — a note made with GPS off still saves, geometry simply null. Nothing is ever lost.

Pro

See your world on a globe

Unlock a fluid 3D Mapbox globe — satellite, standard, night, or outdoors — and fly from a note to the exact spot it was written. It stays smooth offline across the areas you have already explored; downloadable regions for brand-new places are on the way.

No lock-in

This is what a note is.

Not an export. Not an approximation. The file on disk is a GeoJSON Feature, with your words and the sensor reading of the moment living side by side in properties. Back up your whole journal as a single .geojson file anytime.

{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [-94.3683, 36.8689, 342.4]
  },
  "properties": {
    "title": "Spring on the bluff trail",
    "date": "2026-04-18T07:52:11Z",
    "placeName": "Neosho, MO",
    "timeZone": "America/Chicago",
    "weather": { "condition": "Partly Cloudy", "temperatureC": 14.2 },
    "elevation": 342.4,
    "horizontalAccuracy": 4.9,
    "course": 271.0,
    "tags": ["trail", "morning", "spring"]
  }
}

Field notes that are real GeoJSON.

Built for where themap runs out.