time to buy a gps, which one?

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lazydays wrote:
I'd like to buy a gps but I know there are issues regarding which ones a mac can talk to...I want a nice large easy to read screen, voice instructions, and a good way to mount it in the car. I'd also like to switch it between my two cars so being able to get an additional mount would be handy

If you have an iPhone, there are several solutions that meet your requirements. There's a good survey here:

http://artoftheiphone.com/2009/11/18/a-g...tion-apps/

One of the nice things about an iPhone-based solution is that the iPhone uses A-GPS which allows must faster initialization. The iPhone also has the advantage of providing portable GPS services.

Note that some of the GPS car mounts contain their own GPS receivers and speakers and therefore can also be used with the newer iPod touch models, e.g. The Dual GPS Cradle. Also check out Navigon, TomTom, Kensington, Magellan.