Inside the Altimeter GPS app you can find and freely consult 7 Open Source maps.
This application provides the user with seven extremely clear and detailed topographic maps (amazingly clear) making maximum use of the power of Retina technology and the use of realistic symbols and colors.
Maps are designed for hikers, mountain bikers, trekkers and all outdoor enthusiasts. The maps are ultra detailed and constantly updated.
Some of them are based on OpenStreetMap, a world map, created by people like you and free to use under an open license.
From OpenStreetMap to specific maps for hikers and cyclists. You will also find the most hidden paths and all the peaks.
Internet connection is required to view maps.