Online QTH grid locator
Here is a nice website to find the location of a grid square on a map. Beside being able to locate 2, 4 or 6 character Maidenhead grid squares, it can locate distances between squares. Left click on the map and you will be given the latitude and longitude, sixcharacter grid square and the option to select this as the start point for distance calculations. So set the start point of your QTH and then see the distance come up when you left click on other grid squares. Grid squares can be located by entering the grid characters in the box at the bottom of that site’s web page.
Thanks to Laurent, F6FVYfor providing this online tool that works with Google Maps.