I was thinking the other day why some people's screens start up on sat-nav, some on radio etc. and from a previous thread found out that there's no way to change it. So I was fiddling with the RNS-E the other day and found that there is a way (and apologies if most ppl know this or if it's in the manual, but I couldn't find it there).
Basically if you want to start up the system on maps, hold down the maps button (bottom right) whilst switching off the whole system. On switching on the system now it should start up on maps. Same thing with Radio. I get really annoyed when I always have to press the Memory button to start up on my favourites. Hold down the memory button whilst holding down the on/off switch. Then when you next start the car it should start the RNS-E in this position. Neat little trick huh? So glad I found it as I was getting quite p*d off that my system was always starting up on the Navigation input screen.