Depends somewhat on your phone. My iPhone 6S never got better indicated than 16'. 12 Pro gets to 13' and sometimes 9'. Those seem to be accurate remembering 13' is a 26' diameter circle. The later phone's major advantage is speed. It took 15 or 20 seconds for the 6 to get to max and about 5 seconds for the 12....with good cell coverage.
That brings up another MAJOR advantage of Solocator - you have an excellent idea of how close those coordinates will be. So if you are out in the boonies with 1 bar, you know you need to wait before shooting. Yes, you can pull coordinates off the meta data but how good a lock did you have when that picture was taken?
I do not think the Industrial Package is more accurate, just let's you label and maybe can put out a file of a series of shots. Never tried that.
At the very end of Settings in the $.99 version is an "invitation" to buy the Industry Pack.