AZ topo map-areas show up as crosshatch

[n7ki]

While displaying areas of the AZ topo map, it shows a crosshatch pattern.  It doesn't do it everywhere but it seems to do it randomly.  I downloaded the whole map to my Nuvi 200.

[Boyd]

The crosshatch pattern is usually only seen in an area that the map doesn't cover. Are you seeing it around the edges of the map perhaps?

[-Oz-]

Yes, coordinates where you're seeing this would be great.