FieldGrid, the MGRS and UTM grid app for land navigation

What you can do with FieldGrid

Know your grid

• Read your position live on the Map tab as MGRS, UTM, Lat / Lon or a Google Maps link, with a second format underneath and the GPS accuracy in metres next to it.
• Tap the grid to copy it, press and hold to share it, or tap the speaker button to hear it read in the NATO alphabet ("Niner" for 9).
• Spell it for the radio: Tactical tools > POSITION — RADIO FORMAT writes out the whole grid so you can copy or share the text.

Mark and find points

• Save waypoints at your position with WP+, by pressing and holding the map, or by typing an MGRS grid or decimal lat/long. The Waypoints list shows distance and true bearing from you to each one.
• Project a point you can see: By distance and bearing… takes metres or kilometres and degrees or mils and saves the resulting grid.
• Jump the map to any MGRS grid or lat/long with GOTO, and share waypoints as a GPX file for other mapping tools.

Field tools

• A compass in degrees true and NATO mils (6,400 to a circle).
• A tap-based pace counter with a mission clock that works out distance and speed.
• Sun & Moon: BMNT, EENT, sunrise, sunset, all twilights, moonrise, moonset and moon illumination for today at your position.
• Night mode with a red overlay, range rings and a centre crosshair that shows the grid under it.

Quick start

1. Open FieldGrid and allow location while using the app. Without it the map shows GPS UNAVAILABLE and an OPEN SETTINGS button.
2. Wait until the accuracy next to the grid drops to a few metres.
3. Read your grid at the top of the Map tab. At 37.74870, -119.58720 it reads 11SKB 7205 8108.
4. To change the big format, open the gear, then Settings > Coordinate format and pick the Primary and Secondary formats.
5. Press WP+ to save where you stand, or press and hold it for more ways to add a point.

Free, and what the optional Pro adds

FieldGrid costs nothing to download, and it shows ads. Every coordinate format, the compass, the pace counter, Sun & Moon, the report templates, the widget and up to 5 waypoints come free. Watch a short rewarded ad and you get one more waypoint slot, permanently, for that ad.

FieldGrid Pro is a monthly or yearly subscription, or a one-time lifetime buy if you'd rather pay once and forget about it. It adds unlimited waypoints, track recording with the Tracks tab and GPX export of tracks, export of all waypoints at once, Apple Watch use with no 5-minute cap, and drops every ad.

Privacy, offline use and permissions

Your position, grids, compass, waypoints, offset tool, pace counter and sun and moon times all come straight from the phone, no cell signal required. The map picture underneath is Apple Maps, and that part does need data. Lose signal and you still get your grid; you just lose the pretty background behind it, since there is no offline map download.

No account to create, no login screen, nothing. Waypoints and tracks stay on your device and on your own Apple Watch, full stop. The free version does load Google ads, which is why iOS pops up the tracking prompt; tapping no there still leaves every feature working exactly the same.

Limits worth knowing before you rely on it

• MGRS is always 8 digits (a 10 m square). There is no 6- or 10-digit option and no degrees-minutes-seconds format.
• The MGRS grid map overlay draws latitude and longitude lines, not the 1 km squares of a paper map. Plot from the numbers, not the drawn lines.
• The compass is the phone's magnetometer showing true heading, with no declination setting. It is not a lensatic compass.
• Units are metric only: metres, kilometres and km/h.