hh3uunp - is the oem satnav setup any good? - that's open to different viewpoints. To owners who *must* have the oem look in the dash then it is 'good'. To those who want modern techynology without having to spend significant amounts buying add-on interfaces or retrofitting looms and modules etc which could turn out to be faulty or become faulty, then the oem setup is not good.
Joelgk - There is nothing from the aftermarket premium brands which directly replace the oem audio setups in the E39's simply because when these cars were new, the vast majority of owners didn't want upgraded audio fitted etc, so demand was very low for anything to be developed. It's only been a couple of years the cheap chinese replacements have been available for the the E39. Those units are hit and miss for the quality aspects. When pixels fail, modules fail, amplifiers crap out, CD changers go kaput, monitors backlights give up etc etc on the oem modules, the only options are to replace with other similarly aged units that are currently working or, see if any of the fixes which are available work to make your unit's operable again.