I use a Garmin Nuvi 650. Cost around $250. I have no idea how it works when walking around, as that's not my bag, but it's great in the car. My advice would be to look at their website and pick the features that are important to you, then seek a suitable model. There are things on mine that I would not want to do without, such as the thing telling me in advance if I am in the correct lane on a bazillion lane LA freeway, for an upcoming exit.
JR
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