I'm confused about the way resolution, level and levels interact. I started with a set of supplied styles (actually from Marco Certelli's CreateIMG package) which used resolutions 14, 16, 18, 20, 22 & 24 for various kinds of roads. I wanted to change residential roads to come higher than tertiary roads (resolution=22) but lower than footways & tracks (resolution=24), so I changed them to be at resolution=23. Unfortunately this didn't work -- they appeared and disappeared at the same time as the the resolution=22 tertiary roads. I then changed the levels specification from the supplied levels = 0:24, 1:22, 2:20, 3:18, 4:16 to levels = 0:24, 1:23, 2:22, 3:20, 4:18, 5:16 and everything sprang into life working as desired. This behaviour was consistent between BaseCamp and my Oregon. The documentation in http://wiki.openstreetmap.org/wiki/Mkgmap/help/style_rules had led me to think (though I guess it doesn't say so explicitly) that level & levels were meaningful only to the Mkgmap compiler, and were converted to resolution in the final Garmin format map files. As a result I was surprised that changing the levels specification had any effect at all, since all rules used resolution rather than level anyway. Could anyone shed any light on this behaviour? Thanks! -- Cheers, John