[OSX-Users] Re: battery packs for iphones

[Daniel Thorpe]

The problem you'll have Neil is that using the Core Location framework  
is quite costly, battery wise. So to get fraction-of-a-second timing  
accuracy (and presumably you want similar accuracy in space), you'll  
not get anything close to 3 hours of battery life....

On 28 Jul 2009, at 11:24, Neil Broderick wrote:

> Hi,
> with regards extending the battery lifetime of the iphone has anyone  
> tried
> any of the external battery packs that you can buy? Ideally I want  
> to be able
> to record a 6 or 7 hour GPS track when going on a long ride and  
> currently
> the iphone battery dies after about 3 hours.
>
> Also does anyone know if it is possible to get the raw timing data  
> out of
> the GPS chip? Being slightly deranged I would love to know the time to
> nanosecond accuracy and since there is a GPS chip in my phone that
> information is there and I just have to figure out how to get it.
>
> cheers,
> Neil