When comparing ZANavi vs Navmii GPS World (Navfree), the Slant community recommends Navmii GPS World (Navfree) for most people. In the question“What are the best offline GPS navigation apps for Android?” Navmii GPS World (Navfree) is ranked 9th while ZANavi is ranked 18th.
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Pros
Pro Anyone can use or share the code
It's licensed under GPL which make sit ope-source, where anyone can look at or use the code which allows for an open understanding of the app.
Pro Usability focused
The core of the app is designed around ease of use which makes it an intuitive app to use.
Pro Crowd sourced traffic information and reporting
Pro Convenient offline support
Navmii GPS World (Navfree) uses OSM (OpenStreetMap) data which means it stores the maps on local storage so the user can use the app offline with zero data usage. This is great for those that need to use a navigation app but will have no data connection.
Pro Works good for hands free navigation
Navmii GPS World (Navfree) has voice guided navigation for its maps, even offline so users do not need to mess around with the app while driving, which is safer than having to constantly look at ones device.
Pro Fast map rendering
Cons
Con Limited maps
There are many missing maps from the database making for user limitation depending on the are one lives.
Con Sometimed strange detours before reaching your destination, even at short distances.
Con Quality of images not the best
The quality of images in the app are sometimes not the best . It is caused by some form of conversion, which may save room but limits the apps looks.