![]() ![]() They measure 2.5 minutes latitude by 5 minutes longitude, roughly corresponding to 3 × 4 miles in the continental US. 1st and 2nd Characters: (Check the North American Grid Locator or the ARRL World Grid Locator Atlas.) 3rd Character: Take the number of whole degrees west longitude, and consult the following chart: 4th Character: This number is the same as the 2nd single digit of your latitude. ![]() These more precise locators are used as part of the exchange in the 10-GHz contest. (See the publications catalog elsewhere in this issue. A grid square is indicated by two letters (the field) and two numbers (the square), as in FN31, the grid square within which W1AW, ARRL's Maxim Memorial Station, resides.Įach subsquare is designated by the addition of two letters after the grid square, as FN44ig. A grid-square map and an atlas are available from the ARRL. Grid squares are a shorthand means of describing your general location anywhere on the Earth in a manner that is easy to communicate over the air.Īn 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 in the continental US. ![]() One of the first things you will notice when you tune the low end of any VHF band is that most QSOs include an exchange of "grid squares." What are grid squares? Well, they're more like rectangles and are just a way of dividing up the surface of the Earth. ![]()
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