This problem exists in R1228 thru R 1311. I have a routable trail map generated from GPSMapedit with contours going from about 6000 ft. to 9000 ft. in 40 foot intervals. Contours from 7760 ft to 7440 ft, Intermediate (0x21), and Minor (0x20) contour lines set to Endlevel 1, disappear in Mapsource and on my GPSmap60CSX at zooms below .5 miles. I think this is at zoom levels 0 and 1? Contours outside of the 7760 to 7440 range display correctly at all zoom ranges. The problem DOESN'T EXIST and all contours display correctly if the map is compiled with R1127. Don't know if this is an issue for mkgmap, since Polish files are not the primary supported source material, but thought you might be interested. Thanks, Hilton Long