Hi @cincydrones,
Welcome to our community!
The best way to check accuracy is to collect a benchmark with known coordinates and compare the known values with the collected values. Please make sure that the compared coordinates are in the same datum. I’d also like to note that open-source maps, such as Google Maps/Earth, usually give only an approximate position of the objects. You can find additional details in this thread.
How did you set up your base? Was it at a known point, or did you use averaging? As the guys also mentioned, using average SINGLE can affect absolute accuracy.