// Create small milfoil patch marker icons
    var iconRed = new GIcon();
    iconRed.image = "./blankmarkers/mm_20_red.png";
    iconRed.shadow = "./blankmarkers/mm_20_shadow.png";
    iconRed.iconSize = new GSize(12, 20);
    iconRed.shadowSize = new GSize(22, 20);
    iconRed.iconAnchor = new GPoint(6, 20);
    iconRed.infoWindowAnchor = new GPoint(5, 1);
    var iconWhite = new GIcon();
    iconWhite.image = "./blankmarkers/mm_20_white.png";
    iconWhite.shadow = "./blankmarkers/mm_20_shadow.png";
    iconWhite.iconSize = new GSize(12, 20);
    iconWhite.shadowSize = new GSize(22, 20);
    iconWhite.iconAnchor = new GPoint(6, 20);
    iconWhite.infoWindowAnchor = new GPoint(5, 1);
    var iconBlack = new GIcon();
    iconBlack.image = "./blankmarkers/mm_20_black.png";
    iconBlack.shadow = "./blankmarkers/mm_20_shadow.png";
    iconBlack.iconSize = new GSize(12, 20);
    iconBlack.shadowSize = new GSize(22, 20);
    iconBlack.iconAnchor = new GPoint(6, 20);
    iconBlack.infoWindowAnchor = new GPoint(5, 1);
    var iconGreen = new GIcon();
    iconGreen.image = "./blankmarkers/mm_20_green.png";
    iconGreen.shadow = "./blankmarkers/mm_20_shadow.png";
    iconGreen.iconSize = new GSize(12, 20);
    iconGreen.shadowSize = new GSize(22, 20);
    iconGreen.iconAnchor = new GPoint(6, 20);
    iconGreen.infoWindowAnchor = new GPoint(5, 1);
    var iconOrange = new GIcon();
    iconOrange.image = "./blankmarkers/mm_20_orange.png";
    iconOrange.shadow = "./blankmarkers/mm_20_shadow.png";
    iconOrange.iconSize = new GSize(12, 20);
    iconOrange.shadowSize = new GSize(22, 20);
    iconOrange.iconAnchor = new GPoint(6, 20);
    iconOrange.infoWindowAnchor = new GPoint(5, 1);
    var iconBlue = new GIcon();
    iconBlue.image = "./blankmarkers/mm_20_blue.png";
    iconBlue.shadow = "./blankmarkers/mm_20_shadow.png";
    iconBlue.iconSize = new GSize(12, 20);
    iconBlue.shadowSize = new GSize(22, 20);
    iconBlue.iconAnchor = new GPoint(6, 20);
    iconBlue.infoWindowAnchor = new GPoint(5, 1);
    var iconCyan = new GIcon();
    iconCyan.image = "./blankmarkers/mm_20_cyan.png";
    iconCyan.shadow = "./blankmarkers/mm_20_shadow.png";
    iconCyan.iconSize = new GSize(12, 20);
    iconCyan.shadowSize = new GSize(22, 20);
    iconCyan.iconAnchor = new GPoint(6, 20);
    iconCyan.infoWindowAnchor = new GPoint(5, 1);