In VHF/UHF, one of the main pieces of information usually exchanged is the grid square location. It consists of 2 letters, 2 numbers and then 2 letters and is derived from the latitude and longitude of a location. For example, the grid square location for a location in the middle of the river just above the Falls at Niagara Falls is FN03LC. Here’s a link to a web page which will tell you your grid square location, based on GoogleMaps. Just zoom in on the location you want the grid square location for and click on that location. The latitude and longitude of the location will be displayed, along with the grid square location.