What is GpsMid?
GpsMid is a free, fully offline, vector based map application for your mobile phone. It displays your current position on a zoomable map and can be used to search for and navigate to roads or points of interest of your liking. As all data is stored in a compact binary format on your phone you will incur no charges for extra data downloads.
The program is no longer updated. Last version, 0.8.2, released in September 2012, can be still downloaded from SourceForge