So I've been looking at buying an 8v for a few weeks now, and having just sold my 8p I'm looking at a few more 8v's. I've noticed that some 8V's are advertised with satnav, I assumed all 8v's were satnav capable since they have the button for it. Anyway, if I bought one without satnav functionality would I just need to purchase a disk or is it more complex? Thanks.