For the KML output functions, it would be nice to add additional folders in the layers for content. So under Isobaths, Major & Minor Contours....instead of having a super long list of item entries, group all entries 0-5ft into one folder called "0-5ft", and so on. This would allow turning on/off all layers of that type easily, or to simply save out just those desired contours. It wouldn't take much additional code in the KML data either, so it would be a negligible increase in file size, and don't think it would affect performance at all.