Location Accuracy

Hello, I love the ability to export LAS files from scans in my Scaniverse App. I would like to be able to have more reliable orientation of my scans. I think by adding an external bluetooth GPS and switching to Airplane mode, it seems to improve the orientation. Are there any limits on accuracy? Does the app calculate model orientation purely from GPS, or does it use the phones compass too? I am wondering if I get a better GPS if it will improve the orientation reliability? Is there a limt to the amount of decimal places it will record/read fromt he GPS feed?