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What is MGRS? A Simple Guide
Everything you need to know about the Military Grid Reference System (MGRS) explained in plain English.
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If you have a set of numbers like 18T WL 848 122 and just need to see where it is on a map or convert it to standard GPS coordinates, you don't need to read this whole guide.
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Convert Coordinates in Seconds (No Setup Needed)What is MGRS?
The Military Grid Reference System (MGRS) is the standard geographic coordinate system used by NATO militaries. It is also highly popular among search and rescue teams, disaster relief organizations, and hardcore outdoor enthusiasts.
MGRS is designed to be spoken over a radio clearly and concisely, without the confusing decimal points found in standard Latitude and Longitude.
How to Read an MGRS Coordinate
A typical MGRS coordinate looks like this: 18T WL 848 122
- 18T (Grid Zone Designator): This tells you which massive chunk of the world you are in (similar to a UTM zone).
- WL (100,000-meter Square Identifier): This is a two-letter code that narrows your location down to a specific 100km by 100km square. This replaces the long numbers used in UTM.
- 848 122 (Numerical Location): The first half (848) tells you how far East to go, and the second half (122) tells you how far North to go within that square.
Understanding MGRS Precision Levels
The length of the numbers at the end of an MGRS coordinate tells you how precise the location is. The more numbers you have, the smaller the box you are identifying.
| Format | Digits | Precision (Accuracy) |
|---|---|---|
| 18T WL 8 1 | 2 digits | 10,000 meters (10 km) |
| 18T WL 84 12 | 4 digits | 1,000 meters (1 km) |
| 18T WL 848 122 | 6 digits | 100 meters |
| 18T WL 8483 1224 | 8 digits | 10 meters |
| 18T WL 84835 12247 | 10 digits | 1 meter (Standard for troops) |
Convert GPS to MGRS Instantly
Need to share your location with someone using MGRS? Convert your phone's GPS coordinates easily.
Open Lat/Long to MGRS ConverterFrequently Asked Questions
Is MGRS better than Latitude and Longitude?
Not necessarily "better", but it is much easier to communicate. Saying "Whiskey Lima Eight Four Eight One Two Two" over a static-filled radio is much less likely to be misunderstood than saying "Forty point seven one two eight degrees north, negative seventy four point zero zero six zero degrees west."
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Warning: Verify Your Calculation
Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:
GPS Accuracy Alert
Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.
Check My Accuracy →Datum Shift Risk
Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.
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