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For this use case, let me recommend http://gaiagps.com/

You do need a subscription for offline maps...but you get very good map layers for outdoor use (some based on OSM data, some based on "official" sources like USGS or Ordnance Survey), you can create routes and tracks, set waypoints etc.

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Second Gaia for outdoor activities. Map layers you won't find anywhere else; some that I use frequently are cell coverage, snow depth, many different aerial layers options, public / private land. They incorporate many region / country specific topo and aerial layers too. Their website is also great for trip planning, and the data you create there syncs with the app. Well worth the $40 annual subscription for me.

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