RaDAR Google group
Now the phone app for RaDAR!
Part of the exchange for RaDAR is the grid square you are operating from. The more resolution on the grid square the better. Probably many folks have never seen a grid square like this. See the grid square at the bottom of the screen shot.
There are plenty of apps that can display this level of detail. Check your Apple Store or Android Play Store for new apps being added frequently.