[Xastir] is it possible to choose priority of tiled OSM maps?

[Fred Hillhouse]

> unfortunately on high
> zoom levels some tiles are not available, but are avail on mapnik, 
> which I would like to see in places where cyclemaps are missing (so 
> 'lower' layer)

Coffee not strong enough apparently this morning!
Edited for clarity.
 
Revisit areas that were not previously rendered. They may have been
rendered.

I believe that cycle maps only renders tiles to a certain level until it is
requested. Then, the tiles are rendered and become available.

Best regards,
Fred