GPS working fine before upgrade. Now neither google maps nor tomtom can find a sattelite. I appears that the OS and the GPS receiver can't communicate. Did restore w/ backup several times to no avail. Then did hard reset - no success either. According to forums on other Navigation app sites many people are having this problem. Anyone else find a solution other than the hard reset (which appears to work for some), resetting restrictions, and turning off 3G? Only solution that I see now is to downgrade to OS3.1.3.
Update on my previous post: I was finally able to get Navigon to work on a recent trip to Toronto. Problem is, once we hit Toronto and Navigon began recalculating the route based on traffic info, it continuously lost the GPS lock and would require 15-20 seconds to lock on again (not easy when you don't know where you're going). It finally required a hard reset of the phone in order to work (thanks for that traffic jam otherwise I would have missed my exit by a long shot). It seems as if every time Navigon recalculates a route or gets interrupted (SMS, phone call), the GPS lock is lost. Is this just a Navigon issue or is it happening to other apps like TomTom (not just Google Maps which doesn't really require a good GPS lock to work)?
Also having issues with GPS after upgrading. I also restored and re-installed all apps needing GPS and still having issues. Come on Apple, it's been almost 2 months!
My problem has resolved itself. Unhelpfully I can't say why. I did spend 30 mins outside trying to get a fix. I never had an accurate fix in that time. However that weekend GPS started working better than ever. Coincidence?
I can't say for certain, but I strongly believe the problem is a loose or damaged wifi / GPS antenna. Mine konked out after a long drive and there's always a lot of heat on the 3G when charging and using GPS. I think it finally cooked the antenna. The fix is exceedingly difficult (a full disassembly) so I'm probably going to bite the bullet and upgrade.
I believe your antenna cooked soon after the upgrade (it still might be iOS 4 related, but I believe the damage to be permanent; no software will fix this unless we're really lucky!)
I'm getting very interested in GPS problems across the iPhone range. Ive got a 3GS and the GPS satellite fix stopped working completely recently. A fix identified using jailbreak and an ssh terminal tells me a good proportion of these problems are with locationd, the gps process in the iPhone, or more accurately, I think that it's possible for some of the data this process uses to become corrupted; the "fix" involves stopping the process and deleting the data it uses. On restart, locations is forced to rebuild the data, and everything then works.
I suspect this is true across the iPhone range - and worse, I think that the backup function in iTunes actually backs up the bad data. Thus, when you restore from backup, you actually put the problem back in! Either that, or GPS cache data isnt deleted when the iphone is restored.
What we need is an option in iTunes, or the iPhone settings, to clear GPS ephemeris and related data down and restart locationd: this will save apple a fortune in support at genius bars, as I reckon everyone who is getting a replacement is just getting a reblanked refurbished iPhone with no hardware fixes - they could be turning them around in the back of the stores!
We need to get some group pressure together to get an answer out of apple on this really - they do seem to have an approach which has much in common with the way the UK banks were dealing with overdraft fees - if you complained, they refunded just to keep you quiet and make sure you didn't shout. If this issue is an underlying gps driver or application demon issue, they should give us a way to work around the issue.
