LAYER_GROUP <group name> <offset> This specifies which layer group (z order) to draw the polygon in. The definition is the same as the ATTR_layer_group command in the OBJ8 spec. .... .... OBJ8 Spec : When the ATTR_layer_group is included somewhere in an object [chrisk: as per the above, use "LAYER_GROUP <x> <x>" in POLs and LINs] then the object is drawn in a different layer group. The offset is used to prioritize further–for example. the group + 1 is drawn after the group, and the group – 2 is drawn two layers before objects. You can use an offset from -5 to + 5. The valid layer names [chrisk: in increasing order of priority] are: terrain, beaches, shoulders, taxiways, runways, markings, airports, roads, objects, light_objects, cars Note: the group “airports” covers all airport drawing. Within this group are the sub-groups shoulders, taxiways, runways, and markings. Markings are for taxilines and thus are on top of all other layers.