diff --git a/html/config.js b/html/config.js
index 2346f55..a1c01bb 100644
--- a/html/config.js
+++ b/html/config.js
@@ -72,10 +72,9 @@
 
 //lineWidth = 1;
 
-// 0 to 100 to set a brightness for and enable monochrome aircraft markers / tracks
-// -1 to use colored markers / tracks (default)
-//monochromeMarkers = -1;
-//monochromeTracks = -1;
+// constant html color for markers / tracks
+//monochromeMarkers = "#FFFFFF";
+//monochromeTracks = "#000000";
 
 // These settings control the coloring of aircraft by altitude.
 // All color values are given as Hue (0-359) / Saturation (0-100) / Lightness (0-100)
diff --git a/html/defaults.js b/html/defaults.js
index cdbd530..09bc15a 100644
--- a/html/defaults.js
+++ b/html/defaults.js
@@ -63,10 +63,9 @@ var largeMode = 1;
 
 var lineWidth = 1;
 
-// 0 to 100 to set a brightness for and enable monochrome aircraft markers / tracks
-// -1 to use colored markers / tracks (default)
-var monochromeMarkers = -1;
-var monochromeTracks = -1;
+// constant html color for markers / tracks
+var monochromeMarkers = null;
+var monochromeTracks = null;
 
 // These settings control the coloring of aircraft by altitude.
 // All color values are given as Hue (0-359) / Saturation (0-100) / Lightness (0-100)
diff --git a/html/planeObject.js b/html/planeObject.js
index e03c145..823796b 100644
--- a/html/planeObject.js
+++ b/html/planeObject.js
@@ -551,6 +551,9 @@ PlaneObject.prototype.getMarkerColor = function() {
     if (this.squawk in SpecialSquawks)
         return SpecialSquawks[this.squawk].markerColor;
 
+    if (monochromeMarkers) {
+        return monochromeMarkers;
+    }
 
     var h, s, l;
 
@@ -560,11 +563,6 @@ PlaneObject.prototype.getMarkerColor = function() {
     s = colorArr[1];
     l = colorArr[2];
 
-    if (monochromeMarkers >= 0) {
-        s = 0;
-        l = monochromeMarkers;
-    }
-
     // If we have not seen a recent position update, change color
     if (this.seen_pos > 15 && !globeIndex)  {
         h += ColorByAlt.stale.h;
@@ -1363,11 +1361,10 @@ PlaneObject.prototype.altitudeLines = function(segment) {
         colorArr = [colorArr[0], colorArr[1], colorArr[2] * 0.7];
     //var color = 'hsl(' + colorArr[0].toFixed(0) + ', ' + colorArr[1].toFixed(0) + '%, ' + colorArr[2].toFixed(0) + '%)';
 
-    if (monochromeTracks >= 0)
-        colorArr = [colorArr[0], 0, monochromeTracks];
-
     var color = hslToRgb(colorArr[0], colorArr[1], colorArr[2]);
 
+    if (monochromeTracks)
+        color = monochromeTracks;
 
     const lineKey = color + '_' + debugTracks + '_' + noVanish + '_' + segment.estimated + '_' + newWidth;
 
diff --git a/html/script.js b/html/script.js
index e3f89ab..f23eefa 100644
--- a/html/script.js
+++ b/html/script.js
@@ -540,16 +540,30 @@ function initialize() {
 
     try {
         const search = new URLSearchParams(window.location.search);
-        if (search.get('monochromeTracks') != undefined) {
-            monochromeTracks = parseInt(search.get('monochromeTracks'));
-            if (isNaN(monochromeTracks) || !(monochromeTracks >= 0 && monochromeTracks <= 100))
-                monochromeTracks = 5;
+        var tracks = search.get('monochromeTracks');
+        if (tracks != undefined) {
+            if (tracks.length == 6)
+                monochromeTracks = '#' + tracks;
+            else
+                monochromeTracks = "#000000";
         }
-        if (search.get('monochromeMarkers') != undefined) {
-            monochromeMarkers = parseInt(search.get('monochromeMarkers'));
-            if (isNaN(monochromeMarkers) || !(monochromeMarkers >= 0 && monochromeMarkers <= 100))
-                monochromeMarkers = 95;
+
+        var markers = search.get('monochromeMarkers');
+        if (markers != undefined) {
+            if (markers.length == 6)
+                monochromeMarkers = '#' + markers;
+            else
+                monochromeMarkers = "#FFFFFF";
         }
+
+        var outlineColor = search.get('outlineColor');
+        if (outlineColor != undefined) {
+            if (markers.length == 6)
+                OutlineADSBColor = '#' + outlineColor;
+            else
+                OutlineADSBColor = "#000000";
+        }
+
         if (search.get('largeMode') != undefined) {
             var tmp = parseInt(search.get('largeMode'));
             console.log(tmp);