There are a lot of sites online that will give your coordinates for a specific place. You can find them with google. I bet there's an app for it too. Also, if you use Litchi and have the correct box checked, the coordinates of your AC will show on your mobile device.
But it may not be necessary to give coordinates. For example, you could say "I'm flying over the Gregg Rd area which is in the far SE corner of your five mile radius..." Chances are the guy at the airport knows where you're flying. But if he wants your coordinates, it would be nice to give them to him, so have them ready.
Satellites - the number is on your flight app if you use Litchi. If you're not using an app, the rear lights will flash while it acquires satellites to communicate to you the important satellite numbers.