Early Vantage SatNav Update

I have a 2006 AM V8 Vantage with the early Volvo type satnav, the one renowned for being not so good. Does anyone know what the latest map/software update is for these systems and where is best to get them from? Am I best going to Aston or Volvo or is there an online alternative? Don't want to spend a fortune but I'm planning a few trips away this year and I feel an up to date 2017 sat nav may help!

Thanks
Sam

I've ordered the disc from latestsatnav.co.uk so I'll stick it in this weekend and see what it's like! Fingers crossed it all works!