[aprssig] Car radio APRS display?

[Greg D]

Hi folks,

I recently acquired a new (to me) car, which has a Audio / Nav / etc. 
display unit in the dash.  The port for the backup camera is unused (no 
camera installed), so I was thinking it would make an interesting place 
to push an APRS map.  Baseband video is all that's required.  According 
to the manual, the reverse gear interlock can be disabled, so I should 
be able to select it when in motion.

I was thinking the original Raspbery Pi might make for a good computer 
to drive it, as it is small, runs a full Linux graphical OS, has a 
built-in video out, and runs on minimal power.  But, what software to 
run, and how to control it without a QWERTY keyboard and/or mouse?  
There is no room on the dash or nearby to host a laptop or tablet or 
such, and none of the existing software I know of is car-friendly 
(thinking driver distractions).

What I really need is something that just comes up with a map and moving 
icons.  Maybe a button or two for zoom in/out, one for a list of 
stations / messages heard, something simple for sending predefined 
messages back.  I'd use one of the small receive-capable "Tracker" sorts 
of units to provide the raw data (RF + TNC).  I don't think any of the 
existing "Ham HUD" sorts of units have internal maps and video out, but 
that would be even ideal.

Any ideas?

Thanks,

Greg  KO6TH