Organic Maps App
Organic Maps is a free Android & iOS offline maps app for travelers, tourists, hikers, and cyclists based on top of crowd-sourced OpenStreetMap data. It is a privacy-focused, open-source fork of Maps.me app (previously known as MapsWithMe), maintained by the same people who created MapsWithMe in 2011.
Organic Maps is one of a few applications nowadays that supports 100% of features without an active Internet connection. Install Organic Maps, download maps, throw away your SIM card (by the way, your operator constantly tracks you), and go for a weeklong trip on a single battery charge without any byte sent to the network.
Organic Maps currently supports map zoom and going back to the WunderLINQ app.