For touring? You need osmand. It's a mapping and navigation app. You download maps and save them, so you don't need an internet connection to use it. It's free to try out, and the full set of maps don't cost much. I haven't tried the 3-D map shading, but that looks good.

And I've used it for car navigation. It works great.

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And Skeye is just a cool thing to have. It's an astronomy app. Just hold it up to the sky to see the planets and stars in that direction.