Help with FSEarth Tiles

[jt233 10]

So sorry if this is the wrong place to post this since I am making scenery for P3D but the question has more to do with FSEarth Tiles itself and didn't know where else to post it. So I have been wanting to get some photoreal scenery for the Test range around Area51 for a while now and just recently found out about this program and have already got it setup and already grabbed some satellite imagery for the area which seemed to come out okay. Now I want to do the whole range if possible but have to do it in small sections at a time due to the memory limit. The problem with this is keeping track of what areas I have already captured or not. 

So is there an easy way to be able to keep track of what I have already captured so I can make sure that I get everything covered and don't grab an area more than once? Also, is it a problem if I capture a certain area in more than one BGL file? I am trying to do it visually and just adjusting the draw area each time I'm ready to capture the next area but it's easy to loose track especially since the terrain is mostly just dessert without a lot of markings.

 

Thanks