Help with Mitsubishi sat nav

Tboll Registered Users Posts: 1
New Traveler
edited January 2019 in Built in car navigation
I have mess of updating maps via
Mitsubishi navigation shop site and now not working. Mitsubishi are a waste of space on the help front, want £102/hr, not likely!!
how do I purchase maps from TomTom and down on to sad card? At present my card is not recognised. So please help appreciated.