Sat nav postcode issue
 

HI there!

I recently had to buy a new battery for my 2010 Mazda CX7 and since changing the battery I am unable to use my SatNav. When I select address the postcode section is already pre-populated with the letter D and will only accept numbers. I am in the UK and my car seems to be confused and thinks i'm somewhere where all postcodes start with a D?! Anyone have any idea how to fix this? I'm due to drive to London on Wednesday and really NEED to use my satnav, any of you guys aware of how to fix this? Thanks in advance.