Hello, 
I have an iPhone 3GS 16GB. Recently Navigon has been behaving very oddly. Using 
Direct Help my reported position leaps all over the place generally within 100 
yards or so of where I am. If I look at options and GPS info my latitude and 
longitude are usually zero but sometimes contain plausible values. 

I have only noticed this since upgrading the iPhone to IOS 4.3.5a week or so 
ago but this may be coincidence.

Are there any options I should check relating to the built-in GPS? Is there any 
way of testing the built-in GPS? Could weather conditions or other external 
events be relevant?

I do have an external bluetooth GPS receiver which I used to use with Loadstone 
software on a Nokia phone. If the GPS in my iPhone is failing can I set up the 
iPhone to use the above external GPS instead? 

Many thanks. 

Paul Hopewell 
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