Hey everyone.  I just installed a W4400 in my outback and after installing I realized it didn't come with onboard Nav without using carplay.  I spend a lot of time hiking and usually don't have service where I go.  Is there a way to mod the 4400 to have nav?  I know now I should've gotten the 8400.  Any help is appreciated.  I know I can order the standalone unit to add nav, but for the price of that I'd rather just get a different head unit.