My iPhone GPS works well for me, believe it or not it's my first device of that sort. I've been comfy with the Thomas Guides for a long time. But I'm liking this. One thing I've noticed, Google maps in general really sucks down battery charge in a hurry. Data, dunno, I have an unlimited plan.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K