data base of favourite walking areas

Is there an app available that would download a number of map areas and name them so they could be used when no internet connection is available. In effect making a database of favourite walking areas that could be used with a navigation program on an Iphone I’m new to this technology so please forgive me if this has been covered before. I purchased the the forever map 2 app but its missing user added content and only has an outline image of one of the areas that i’m interested in

There are several solutions to have OSM data or maps stored on a mobile device:

For Aplple iOS, see and do a search for “offline” within your browser.