Ralf Kleineisel schrieb:
  

Another approach to this would be to create two map layers with two
different TYP files. The lower, normal map layer contains the roads and the
routing information. The second layer is transparent and only contains
additional graphics for drawing on top of the map layer, e.g. colored bike
route markings, tunnels, bridges and so on.
    

I thought about this, and I am going to try this approach next, since I
don't have the time to implement the proposed extension of mkgmap by myself.

But this solution will not help the POI problem.

And the solution is also much less flexible: You have to decide before
the map generation, which items shall be drawn on which layer. And you
also need to decide before, how many layers you need. I think my
proposal is much more flexible if you have different combination of
multiple items (e.g. a street is on a bridge, has a cycle lane and is
part of an relation)

And I don't know, how the Garmin devices handle multiple transparent
maps, In mapsource you always get only one map at a time.

Gruss
Torsten
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