can someone give little guide or some software for updating or modding maps for this unit please

as latest i find here are the

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the maps used are the once made for most cars - NavTech maps

so i m sure there is an option to make this work and as the unit is simple handy if u lost

please anyone if you can input knowledge i m sure some of us will still appreciate the effort

and if i make this running i will share here what i made

thx Larry