Free Download BMW gps navigation system buyer's guide. This Guide provides information for BMW owners . This Guide provide information on navigation system what to look for when buying gps vehicle tracking system. There are three major types of navigation systems that BMW has offered as original equipment options and accessory retrofits over the past several years. There are a significant number ofmisidentified or misunderstood navigation computers for sale out there that can leave buyers stranded and or screwed. This document is an attempt to identify the different BMW gps navigation computers available and to help you to identify the one that is right for your project.