5.8" MIB Audio. 7" MIB Audio (With Discover Pro Sat Navigation) Volkswagen Golf has been a big hit ever since the line up came out. It has established it's reputation as reliable compact car for youth, that with quality of German prestige, and price of Japanese / Korean cars. Originally, since Golf MK5, RNS 310 / 315 / 510 audio with factory Sat Nav were available. Known as Discover Navigation system. RNS310, 315 with 5" Color touch screen, and 510 with 6.5" Color touch screen. RCD 510 also had 6.5" Color Touch screen, yet It didn't have built-in Sat Nav and GPS antenna. Yet, back in the day, Navigation wasn't r e ally 'essential' and people could live with external Navigation system - such as from TomTom, Garmin etc. However, as lands gets developed, new streets and roads built and mostly, as In-Car Navigation system has became 'standard feature' for lots of vehicles and ranges. A ...