OsmAnd maps are great for no cell service areas. Uses the gps in your phone and the extremely detailed area maps are downloaded to your phone too. Has hiking trails and fire roads and you can drop breadcrumbs.Gaia GPS on CarPlay is my primary navigation, but folks if you’re going somewhere without cell connection that you’re not familiar with, bring a paper map.
It's not onxoffroad, but is free for basic use and cheap for full use. Guzzles phone battery btw.







