I'm sure this post will be deleted like all my other posts, even thought it pertains helpful info into the problem
I did the exact same thing.. upgraded for better GPS now it's affecting my job my other iPhones did not have this gps problem.
I think it's very sad that you will have to buy a new phone because the gps is so bad in the 11 pro (just like mine) even Apple support could not believe how bad it is and installed a location logging profile but they never called back to to tell me what they found like they said they would.. I screen share:"d with support staff MANY TIMES and every time they can't believe how my location spins and jumps 200 feet away and then slowly drifts back.
i think at the very least they should allow people with the problem to return their phone for a refund toward a a phone like an iPhone 8 that I traded in and I have Apple care which caries zero weight with support
I for example upgraded from an iPhone 8 and now with the 11 pro I can't Uber because it is so bad and that's how I make money Uber said it doesn't route rides to people who's GPS appears to be malfunctioning for the safety of passengers.
since Apple support HAS VERIFED there is an issue and reports are replacements phones are no better and I don't have $1200 to put a hold on my credit card to have they swap the phone by mail since all the stores are closed. I think it is only fair that I should have the option of getting an iPhone 8 that I had zero problems with so I could Uber with
Google strava (a hiking app) they have had so many complaints about the gps issue in the iPhone 11 that they are telling customers it is not our fault the iPhone 11 does not track horizontal data correctly.
also check you logs I got a new SIM card like Apple told me too becaue all my calls were breaking up and disconnecting and my logs show that my modem is disconnecting randomly for no reason for milliseconds at a time causing the break ups and sometime phone doesn't even recognize the modem but recently I've been being signedout of iMessage. I have never had this happen with any of my other phones I don't use iCloud just my phone number I called Apple support last night and they said they HAVE NEVER SEEN THIS MESSAGE I called to see if there is a sever issue as there is nothing to sing me out of like I said I use my phone number and you don't even have to have an Apple account for that
in this time of covid the only way I keep in contact with MY 6 brothers and sisters and elderly parents is our group messages but now I'm missing messages and have to reset the phone all day
I have restored set up as new, DFU restored none of that works
best luck to all