[Nexus 6P Android Development] Kapak13:
I just did a bunch more research on the GPS issue and it seems that the 6p is supposed to be one of the best and most reliable currently. So, with all the research I've personally done, and the very few possible ways of fixing it, its come down to either one of two things...

Give this a try-

Perform an "AGPS reset": Install the App GPS Status & Toolbox, then in that app, go to Menu -> Tools ->

Manage A-GPS State -> Reset, and then Menu -> Tools -> Manage A-GPS State -> Download.

If that doesn't work, then it could be due to a faulty/broken GPS antenna... Which you would have to take your phone into a repair shop (or you could do it yourself if you know what to do) and get it fixed. But having root, an unlocked bootloader, and a custom ROM is going to " void your warranty". I somewhat assume relocking bootloader, unrooting and flashing stock factory image would make it appear still under warranty (if you are still within the warranty period), but I've heard some faint talk about the nexus 6p having some kind of "fuse" that blows when you unlock the bootloader... Making your device warranty unfriendly the moment you chose to unlock it.

If this is all true, you may wanna take it into some third part repair shop for repairs.

I, personally speaking here, don't know how I really feel about repair shops... The best solution would to be doing a lot of research on 6p antennas and watching a lot of how-to videos on taking your phone apart and replacing the GPS antenna yourself.

I know this sounds grim, and it might be, but its modern day, mass manufactured electronics, mess ups happen..

This last bit is pure speculation and is based off no knowledge whatsoever, so bear with me...

I'm wondering if maybe you ever flashed a custom ROM that was built in another country... I'm wondering if you're in the USA and you flashed a ROM from a European developer (just an example), I wonder if the European ROM had GPS data for that country and its still somewhere in your phone. I know that there are multiple regions the GPS will check like Asia, USA, and so on. It might be searching for you with European satellites rather than USA...

If any of the above is possible, maybe the GPS toolbox will help with that.. Again, I don't know what I'm really talking about here, just using my imagination and stretching the limits of possibilities to this issue since I'm running out of ideas and resources for answers.

But again, if the above is true, and GPS toolbox doesn't fix it, maybe you should consider unrooting, locking your bootloader and flash the latest stock factory image. Maybe even do a factory reset with the stock ROM and have it wipe everything back to the day you got it. (Forgot to also say to remove twrp custom recovery...), like go as fresh as the day you unwrapped the box your phone came in. It might clear up any crap left over that might be causing the issue.

After that's all said and done, re unlock bootloader, reflash twrp, relfash custom ROM and see whats up.

I would love to hear anyone in here reading this counter what I'm saying, I want to learn more about this and need arguments against what I'm saying to correct me and guide to the right answer.

I guess I should have asked you first if all, when did the GPS signal issue start? The day you had your phone? After flashing custom ROMs? After flashing this specific ROM? Over time it got worse?

These factors might help you triangulate your issue...

Edit- I should proofread before I submit my replies... I keep editing words for far too long after I've posted haha

Edit 2- I am very happy to hear that my recommendation of BioShock governor is working great for you and giving you more juice to squeeze out of your phone :)