Have you googled for Perl Tk GPS There is some stuff out there. I would think the big problem would be to stitch the edges of the underlying image containing the road info together to make it seamless.

I also would consider using Tk::Zinc instead of the Canvas, since it makes rotations and zooming easier. Zinc is used primarily for Air Traffic Control so I would "assume" it lends itself to using GPS. You might want to ask on the Zinc maillist.

Just for fun, I started something like this, see Tk Zinc Drone plane control. It dosn't have road maps and GPS..... all I need is some funding. :-) But I'll bet Northrup has beat me to the money. :-) See UAV's

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