Can anyone tell me if the freelander comes prewired for a sat nav screen? Has anyone retrofitted the standard screeen into their freelander?

Not aware of any pre-wire being available for retrospective fit sat-nav.

the consensous over on Disco3 is the job will be too big as you'll have to run wiring looms, gps receivers, softwar updates (if possible once this is installed)

better going for a aftermarket, that will give you more functions  Former Mod/Member, with the most post & Chicken George Arch nemesis