[boboguitar]

Do you know if there's a way to do this with built in garmin navigation in cars?

[grecy]

If the Garmin in your dash has a memory card slot, or someway to update the maps, then likely yes.

[kube-system]

Eh, I wouldn't be so sure there. Not sure if Garmin OEM stuff is any different, but many factory head units only load maps signed by the manufacturer.

[boboguitar]

Awesome will have to do some investigation.