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Maidenhead locator
The Maidenhead system divides Earth into labelled geographic cells. Additional characters refine the cell; a locator identifies an area rather than an exact address.
Also found under: Locator · Maidenhead · Grid Square · JN47
A concrete example
JN47 is coarser than JN47db. The calculator uses each cell’s centre for distance and bearing.
What to keep in mind
A calculated great-circle distance is not a measured radio propagation path.
Further reference
Original explanation based on the technical documentation. Reviewed on 15 October 2026.
ARRL · Grid squares ↗