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I have a Garmin thing and a free app on a smartphone. I use Navmii (used to be called navfree).
The Garmin on the whole is slightly better in my opinion but not really that much better that it is worth paying for it!
The Navmii app also has a walking mode which is kind of OK but because it is all done through cell phone towers you can be 15-20 meters away from your turning and it isn't clear which you are meant to take.
If you were to have a decent dedicated "really gets its GPS information from satellites" it would piss over all of these telephone based systems.
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