I have a garmin drive 51 navigation , bought from Germany.
I've installed maps and everything's fine. But i don't know how to put signs for height limit, bridges, tunnels and low-clearances that are specific for trucks.
I've checked navigations for trucks , but they're just too expensive.
Is there a way to update/refresh my navigation so that i can use it like a truck navigation, because i saw that they use the same maps. ...


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