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