Grid Square Tools

Maidenhead grid locator converter and activity heatmap. Convert between grid squares and coordinates, and see which grids have the most amateur radio activity.

🔄 Grid Square Converter

Grid Locator → Coordinates

2, 4, or 6 character locator (e.g. EM, EM85, EM85ou)

Coordinates → Grid Locator

🗺️ Grid Activity Heatmap

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Loading grid activity...

About Maidenhead Grid Squares: The Maidenhead locator system divides the Earth into grid squares used by amateur radio operators for location reference, especially in VHF/UHF contests and satellite work. A 4-character locator (like EM85) covers roughly 1° latitude by 2° longitude. A 6-character locator (like EM85ou) narrows it to about 2.5' by 5'. Activity data combines APRS station positions and Reverse Beacon Network spots.