This app needs a lot of work. Just to give you a couple of examples. Some of the street names are missing from their maps. Also, some of the streets are missing. In Mexicali several of the main streets are not even shown. Like Avenida Francisco Maderos. Where a lot of the doctors are in Mexicali. Also Cristobal Colon, which is the street that takes you to the border crossing.
Fototico about Navmii Offline GPS Mexico