Grid Square Locator Calculator
know your IARU locator? Use this simple online utility to quickly find
it by entering the National Grid Reference for your location and clicking
This calculator works for all locations in the United Kingdom.
What is a Grid Locator?
An instrument of the Maidenhead Locator System (named
after the town outside London where it was first conceived by a meeting of
European VHF managers in 1980), a grid square measures 1° latitude by 2°
longitude and measures approximately 70 × 100 miles. A grid square is
indicated by two letters (the field) and two numbers (the square)
Each square is further divided into subsquares and
designated by the addition of two letters after the grid square, e.g.
Here is our Club location:
National Grid reference - SD563100
Decimal degrees -
Lat: 53.58518 N Lon: 2.66060 W
Degrees minutes seconds-
53º 35' 7" N 2º 39' 38" W
IARU Locator -
IO 83 qo
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