Well considering Open Solo is basically an operating system for your drone, getting it to display HDOP would require some sort of neural interface for your brain to communicate directly with the solo. You'd also need some sort of translation matrix since getting code to "talk" directly with your brain would be somewhat problematic. Now although there are many such commercial interfaces available, I doubt they would be able to perform (or are capable) of performing to the needed standard that you would require. Take for instance the basic unit "force trainer". Is it really reacting to impulses generated by the human mind or is it in fact reacting to electrical stimuli (no matter how slight) of your muscles (which would be a far greater and easier to read level of activity). However in this case you'd actually need the unit to actually be able to feed back information from the drone using Open Solo, pass through a translation matrix and input the information directly into your mind and this such device is not commercially available. The moral and ethical conversations around such a device would cause a huge division between those who welcome such advancement in technologies and those who would see it as a threat to free will, implanted thoughts and leading eventually to a form of mind control. After all, how would one be able to differentiate between something that is a very clear and precise thought/memory of an event and something that was artificially introduced. Now one possible way to help prevent this is a daily memory backup to a secured server which would then be compared to the next days back up to scan for additional information being introduced past an extended 24 cycle. Then again security and freedom of thought would come under fire as who would control such information, who could access it and would it ever be truly secure. So what one might consider a simply act of getting Open Solo to display HDOP could actually bring us down a very dangerous and dark rabbit hole that questions our ability to responsibly evolve with technology. So bearing that in mind you would be best using "Solex" which is an android based interface with which you can control your drone and replaces the 3DR app. It clearly displays the HDOP information at the top of the screen.