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The APRS formats are provided for use in the amateur radio service. Hams are encouraged to apply the APRS formats in the transmission of position, weather and status packets. However, APRS is a registered trademark of Bob Bruninga who reserves the ownership of these protocols for exclusive commercial application and for all reception and plotting applications. Other software engineers desiring to include APRS protocols in their software for sale within or outside of the amateur community will require a license from him. The ARRL (American Radio Relay League) web page http://www.arrl.org/locate/gridinfo.html provides an excellent source of information on Maidenhead grid squares. The page also allows one to interactively determine a grid square from the latitude and longitude provided by the user.