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Google Maps tests new pop-up ads that give you an unnecessary detour
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
I smell reVanced Gmaps coming soon...
Waze works well also.
Edit: I'm getting a lot of down votes and just wanted to clarify that I have never seen an ad in Waze.
I 100% believe people saying there are a lot of ads. I think the way that I have my phone setup is why I'm not getting ads.
Will definitely have to look into the others mentioned here.
OsmAnd is getting there tho.