Quick question about the RNS-E.
Can you use the SD card to store the NaviDisc data and run navigation from one of the cards, or does navigation only work with the NaviDisc in the DVD drive?
No you can't use the SD card to store the navigation data, this will only run via the DVD Disc. Also on the early RNS-E, you can only use a maximum size card of 4gb (not SDHC, basic SD cards only) to store/run MP3 music from.