If' you don't have data on your phone, or are traveling in the US and don't have/want to pay for data roaming, than a GPS unit is quite helpful.
I have an older Garmin Nuvi that I use in the US and it seems to be just fine. It is not updatable, but gets me where I need to go accurately. If you don't want to drop a bunch of money on a new one, used may be a way to go.
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