I think I spoke with the developer about something similar several months ago. 
What I was looking at the time the was using a tile based maps for zoom levels 
way far out showing countries, continents and a world map. I believe what he 
mentioned (my memory is a little hazy so my apologies if I'm wrong...) is that 
he is looking at doing something similar but instead of using both vector and 
tile based data he was going to integrate two zoom levels into the vector map 
data. This would increase the map sizes a bit but the benefit is that it 
wouldn't rely on two different map sets and methods of processing them. It 
should also help with the speed issues as well because the zoom levels showing 
countries and stuff would not have street level detail thus saving a lot of 
processing speed.

As to where all of this is today you might be better off jumping into the navit 
irc channel and talking with the developer and ask him what he is planning on. 
He would be able to clarify what his plans are for such features.

Good luck!

On Wednesday 17 February 2010 01:34:25 am Sybren A. Stüvel wrote:
> Hello List,
> 
> I sent the email below about two weeks ago. Is there nobody that even
> has an opinion on this? I thought it was quite a good idea myself.
> 
> Cheers,
> Sybren
> 
> On 5-2-2010 11:45, Sybren A. Stüvel wrote:
> > Hey folks,
> >
> > Running Navit on my Neo Freerunner is sometimes quite slow. The
> > Freerunner doesn't have a very fast video card, and the drawing of many
> > polygons simply takes up time. I've worked around this problem by
> > removing detail when zooming out.
> >
> > Mapnik tiles show much more detail than Navit could render on my
> > Freerunner, especially when zoomed out. However, I would like to have my
> > entire country (The Netherlands) on my Freerunner, and at all zoom levels
> > that simply takes up too much space when only using Mapnik tiles.
> > Besides, when only supporting tile rendering (like TangoGPS) it's
> > impossible to search the map, do routing, and all the other stuff that
> > makes Navit so cool.
> >
> > My idea would be to have Navit render Mapnik tiles when they are
> > available, and render the map like it does now when there are no tiles
> > available. Then the Mapnik tiles could be used when zoomed out, and when
> > zooming in the Navit renderer can take over. This would give us the best
> > of both worlds.
> >
> > One foreseeable downside would be the rendering of the calculated route.
> > I'd think that this could be solved by rendering it over the Mapnik
> > tiles, albeit not as a solid line but as an outline. I'm thinking about a
> > highway-like line, except not yellow-red-yellow, but
> > blue-transparent-blue.
> >
> > Let me know what you think, what's possible already now, and what would
> > need to be done to get this working.
> >
> > Regards,
> >
> >
> >
> > -------------------------------------------------------------------------
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> >
> >
> > _______________________________________________
> > Navit-users mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/navit-users
> 

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