Just downloaded the COTOPO11 for Colorado (not a Garmin map). I notice the map does not cover 1/3 of the state north of Interstate 70, or at least it does not display on my Garmin 600? Am I correct in observing this? Or am I not displaying it correctly on the Garmin unit?
Cotopo11 includes 'all' of Colorado. Did you send all of the segments (via MapSource or BaseCamp to the 600? If you have a lot of other mapsets on the GPSr, you may have exceeded the unit's segment limit and it is not recognizing those segments.