I got myself a Garmin device for exactly this purpose. Put your own OpenStreetMaps on it and you‘re good to go. Perfect GPS reception and much longer battery life included.

But note that it‘s not the same als Google Maps/Apple Maps. If you want to test it out first, use an OSM-based app for a while, like OSMand, and see if it fits your bill. You get better hiking maps, but you might miss the integration of business opening hours, Yelp, traffic, etc. But for me it‘s worth it, for GP‘s reasons.

People used to live without all these features before, after all.