ESTABLISH POSITION
Read your MGRS grid, check reported GPS accuracy and mark your current location. Grid digits and sensor accuracy stay distinct.
Core navigation ↗OFFLINE LAND NAVIGATION / FIELD READINESS
KNOW YOUR GRID.
HOLD YOUR
BEARING.
MGRS coordinates, waypoint bearings and practical land navigation tools for iPhone and Android. Read your position and plan your next move on the phone you already carry.
Free core navigator · Pro US$3.99/month or US$49.99 once
Explore the field kitRED GRID MGRSSTANDARD
10-DIGIT MGRSOne-metre grid resolution, free
ON-DEVICE NAVIGATIONCore GPS functions without cell service
IOS + ANDROIDNo Red Grid account required
01 / THE FIELD WORKFLOW
Position. Direction.
The next decision.
Keep the essentials close, from setting a destination to recording what you find along the way.
WORK THE ROUTE
Navigate to a waypoint with bearing and distance. Pro adds named waypoint lists, ordered route cards and GPX or KML export.
Route preparation ↗RECORD & REPORT
Prepare structured field reports to copy, and check navigation calculations without leaving your field kit.
Tools and reports ↗02 / FREE & PRO
Start with the grid.
Build out your field kit.
Use the core navigator free. Pro adds the tools for preparing routes, recording observations and working with a radio team.
FREE CORE
$0
10-digit MGRS and the essentials.
No Red Grid account required.
PRO MONTHLY
$3.99 / month
All Pro features.
Cancel through your app store.
PRO LIFETIME
$49.99 / once
Permanent Pro, including future Pro features.
Pay once. No renewal.
| FIELD CAPABILITY | FREE | PRO |
|---|---|---|
| Full 10-digit MGRS · bearing & distance | Included | Included |
| Active navigation waypoint | 1 waypoint | 1 waypoint |
| Saved waypoint lists & route cards | Not included | 10 lists · 20 points each |
| Field tools | 4 tools | All 12 tools |
| Report templates | 3 reports | All 6 reports |
| Incident workspace (ICS 214 activity log) | Read & export saved records | Create & edit |
| Voice grid readout & HUD | Not included | Included |
| Additional coordinate formats & themes | Not included | Included |
| Meshtastic team positions & messaging | Not included | Compatible radios required |
Prices shown in US dollars. Local prices and taxes may differ. Purchases are made in the app through Apple or Google. Monthly renews until cancelled.
Pro is required to create or edit incidents and ICS 214 activity logs. Saved records remain readable and exportable after a subscription expires.
What does Lifetime Pro include?
Pay once for permanent access to all Pro features in Red Grid MGRS, including all future Pro features and updates we release for this app. Existing and new Lifetime purchasers keep Pro through major versions and redesigns, with no renewal, subscription or additional Pro upgrade fee.
Buying Lifetime does not automatically cancel an existing subscription. Cancel it separately through your app store.
OPTIONAL / RADIO TEAM LAYER
Go solo.
Or bring your team.
Solo navigation needs no radio. With Pro and compatible Meshtastic radios, add team positions and short messages over a LoRa mesh. Your phone pairs with its radio over Bluetooth.
See radio requirements ↗PUBLIC SOURCE / PRACTICAL ACCESS
Inspect the code.
Use the app.
We publish the source so you can inspect how Red Grid works, report issues and build it for personal use under the license. The free store app makes core MGRS navigation accessible without developer tools. Optional Pro adds field capabilities and helps fund development, testing and maintenance.
Why source available?
Transparency lets technically minded users examine the calculations, local storage and radio implementation.
Why offer Pro?
Pro pays for a broader field kit in a maintained, ready-to-install app. Core 10-digit MGRS stays free.
The source uses MIT with Commons Clause, which restricts commercial use and reuse. This is source-available software. See the license for the exact terms.
Read the source ↗ · Read the license ↗FIELD NOTES
Know what
you’re taking.
What works without cell service?
GPS grid coordinates, saved waypoints, navigation calculations, tools and report preparation run on your device. Your phone still needs a usable satellite fix. Map display depends on available map data; do not assume an area is available offline.
What is included free?
Full 10-digit MGRS, one active waypoint, bearing and distance, back azimuth, pace count, magnetic declination, distress signalling, and SALUTE, MEDEVAC and SPOT report templates. A 10-digit grid describes a one-metre square; it does not guarantee one-metre GPS accuracy.
Do I need a radio?
No radio is needed for solo navigation. Optional team position and messaging features require Pro and compatible Meshtastic radios. Phones connect to their radios over Bluetooth; the radios carry traffic over LoRa. Radio range depends on equipment and terrain.
Where does my field data go?
No Red Grid account is required. Saved waypoint lists are stored locally. From version 4.1.2, report worksheets and incident records are saved on your device once you save them and survive app restarts; wait for the saved confirmation before closing. Calculator and tool inputs stay in memory for the current session. Delete saved records in the app when you no longer need them, and keep your own exports or backups: uninstalling normally removes app-local data, while exported files and backups may remain, as described in the privacy policy. You can choose to export waypoint files or share information through connected radios. Map requests and app-store purchases use their respective providers. See the privacy policy for details.
How does Pro billing work?
Pro is available for US$3.99 per month or US$49.99 as a one-time Lifetime purchase. Both unlock all Pro features. Lifetime includes all future Red Grid MGRS Pro features and updates, with no renewal or additional Pro upgrade fee. Monthly subscriptions renew until cancelled through your store account. Prices and taxes vary by region; the store shows the final price.
Why publish source and charge for Pro?
We publish the source so you can inspect how Red Grid works, report issues and build it for personal use under the license. The free store app makes core MGRS navigation accessible without developer tools. Optional Pro adds field capabilities and helps fund development, testing and maintenance. The source is available under MIT with Commons Clause, which restricts commercial use and reuse; see the linked license for its terms.
SUPPORT / FEEDBACK
From the field.
Back to the team.
Send a bug report, feature request or partnership enquiry.
RED GRID MGRS / IOS + ANDROID
Your next grid
starts here.
Download free. Add Pro when your field kit needs more.