OsmAnd provides many map choices, so preparation is more useful than changing settings while traveling. Select a transport profile, download the right regions and check the free download allowance before a trip that needs multiple updates.
Download the regions needed for a specific trip and check the remaining allowance before updating maps. Choose a routing profile that matches your transport mode and inspect the proposed route. Save key places as favorites, and compare paid options only if your map coverage or advanced needs exceed Free.