"Poor GPS Reception" error on iPhone Tom Tom GPS

Unfortunately it appears the iPhone's GPS chip isn't up to much as we've all suspected. Some people can get it working while many are reporting, like you, that they get drop outs and poor signal strength errors. This is happening accross all the iPhone Sat Nav apps so it points the finger at the GPS chip itself, especially as many of these people are stating they have dedicated tomtoms and the like that work fine. I've tried Copilot, tomtom and others on the iPhone 3GS and none are able to keep signal long enough to be any good. In fact they are a complete waste of money. It's no suprise Tomtom are releasing a cradle for the iPhone which includes a seperate more powerful GPS receiver...

I had no problems before blackra1n 3.1.2. I was stupid and upgraded my iphone firmware. now gps signal is fucked on my iphone 3gs 16gb

Iphone is simply sucks!! GPS, Wifi faces the same problem. A china phone is much 2 better in a way... an old cheap nokia phone with builtin gps receiver works way better than the MOST expensive for nothing phone in the world. As always steve job talks big when it comes to his new product.
A frustrated iPhone 4 owner..( feel like smashing it on the concrete floor!!)

I actually work with TomTom on this app, and although the internal GPS is generally sufficient for navigation, it can get poor reception in certain regions or when surround by significant physical barriers such as tall buildings. One solution would be the available car kit, which includes and enhanced GPS chip for greater signal strength. Additionally location of device within a vehicle can also affect signal strength. You want a clear line of sight.

The service is completely free and covers almost anything you can think

You could also get a bluetooth gps and connect it to your iphone. much more accurate! you can check to see your gps using the gps-status app in itunes. See the bluetooth gps for iphone in action here