If you decide to get a dedicated GPS device I would get a Garmin Etrex Cx. If you want this feature on your cell phone, then I'd wait for the Nokia E61 to be updated. If you are Asian or a women with small fingers, you might be able to cope with the Nokia E71. Personally I would wait for the next phone in this series which will likely have more capacities, including stand-alone GPS tracking features when you are on cell towers, or satellite tracking when you are off cell towers. My belief is that in a few years the device will use both data sources simultaneously for a far more harmonious experience.
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Andrew Sheldon www.sheldonthinks.com