SAT Nav 2002 E39 M5 Help!!

[minted_aye]

I am looking for someone to advise or fit, SAT Nav in my M5 2002, SOME PEOPLE SAY YOU CAN GET A RETROFIT KIT, BUT bmw DO NOT LIST FOR MY CAR BUT DO FOR ALL OTHER e39'S

I have the full fitting instructions in PDF format, but I am confused over the loom, some list dsp some dont

Anyway I have managed to purchase a 16.9 widescreen and the mkIII nav unit

[minted_aye]

yes thanks for that, I have most of the info already but have conflicting details on the dsp and non dsp, some say you can use the retrofit nav loom, others say I need the full loom.