diff --git a/htdocs/lib/chroma.min.js b/htdocs/lib/chroma.min.js
new file mode 100644
index 0000000..76dd1f8
--- /dev/null
+++ b/htdocs/lib/chroma.min.js
@@ -0,0 +1,58 @@
+/**
+ * chroma.js - JavaScript library for color conversions
+ *
+ * Copyright (c) 2011-2019, Gregor Aisch
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name Gregor Aisch may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL GREGOR AISCH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * -------------------------------------------------------
+ *
+ * chroma.js includes colors from colorbrewer2.org, which are released under
+ * the following license:
+ *
+ * Copyright (c) 2002 Cynthia Brewer, Mark Harrower,
+ * and The Pennsylvania State University.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * ------------------------------------------------------
+ *
+ * Named colors are taken from X11 Color Names.
+ * http://www.w3.org/TR/css3-color/#svg-color
+ *
+ * @preserve
+ */
+
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qt=Gt[jt];Ot[qt.toLowerCase()]=Ot[qt]}var Lt=Ot;return N.average=function(r,a){void 0===a&&(a="lrgb");var e=r.length;if(r=r.map(function(r){return new A(r)}),"lrgb"===a)return rt(r);for(var t=r.shift(),f=t.get(a),o=[],u=0,c=0,n=0;n<f.length;n++)if(f[n]=f[n]||0,o.push(isNaN(f[n])?0:1),"h"===a.charAt(n)&&!isNaN(f[n])){var i=f[n]/180*Je;u+=Ke(i),c+=Qe(i)}var l=t.alpha();r.forEach(function(r){var e=r.get(a);l+=r.alpha();for(var t=0;t<f.length;t++)if(!isNaN(e[t]))if(o[t]++,"h"===a.charAt(t)){var n=e[t]/180*Je;u+=Ke(n),c+=Qe(n)}else f[t]+=e[t]});for(var h=0;h<f.length;h++)if("h"===a.charAt(h)){for(var d=Ze(c/o[h],u/o[h])/Je*180;d<0;)d+=360;for(;360<=d;)d-=360;f[h]=d}else f[h]=f[h]/o[h];return l/=e,new A(f,a).alpha(.99999<l?1:l,!0)},N.bezier=function(r){var e=at(r);return e.scale=function(){return nt(e)},e},N.blend=ct,N.cubehelix=function(o,u,c,i,l){void 0===o&&(o=300),void 0===u&&(u=-1.5),void 0===c&&(c=1),void 0===i&&(i=1),void 0===l&&(l=[0,1]);var h,d=0;"array"===it(l)?h=l[1]-l[0]:(h=0,l=[l,l]);var e=function(r){var e=ht*((o+120)/360+u*r),t=dt(l[0]+h*r,i),n=(0!==d?c[0]+r*d:c)*t*(1-t)/2,a=bt(e),f=st(e);return N(lt([255*(t+n*(-.14861*a+1.78277*f)),255*(t+n*(-.29227*a-.90649*f)),255*(t+n*(1.97294*a)),1]))};return e.start=function(r){return null==r?o:(o=r,e)},e.rotations=function(r){return null==r?u:(u=r,e)},e.gamma=function(r){return null==r?i:(i=r,e)},e.hue=function(r){return null==r?c:("array"===it(c=r)?0==(d=c[1]-c[0])&&(c=c[1]):d=0,e)},e.lightness=function(r){return null==r?l:(h="array"===it(r)?(l=r)[1]-r[0]:(l=[r,r],0),e)},e.scale=function(){return N.scale(e)},e.hue(c),e},N.mix=N.interpolate=$e,N.random=function(){for(var r="#",e=0;e<6;e++)r+="0123456789abcdef".charAt(pt(16*gt()));return new A(r,"hex")},N.scale=nt,N.analyze=Nt.analyze,N.contrast=function(r,e){r=new A(r),e=new A(e);var t=r.luminance(),n=e.luminance();return n<t?(t+.05)/(n+.05):(n+.05)/(t+.05)},N.deltaE=function(r,e,t,n){void 0===t&&(t=1),void 0===n&&(n=1),r=new A(r),e=new A(e);for(var a=Array.from(r.lab()),f=a[0],o=a[1],u=a[2],c=Array.from(e.lab()),i=c[0],l=c[1],h=c[2],d=_t(o*o+u*u),s=_t(l*l+h*h),b=f<16?.511:.040975*f/(1+.01765*f),p=.0638*d/(1+.0131*d)+.638,g=d<1e-6?0:180*xt(u,o)/Pt;g<0;)g+=360;for(;360<=g;)g-=360;var v=164<=g&&g<=345?.56+At(.2*Et(Pt*(g+168)/180)):.36+At(.4*Et(Pt*(g+35)/180)),m=d*d*d*d,y=_t(m/(m+1900)),w=p*(y*v+1-y),k=d-s,M=o-l,N=u-h,_=(f-i)/(t*b),x=k/(n*p);return _t(_*_+x*x+(M*M+N*N-k*k)/(w*w))},N.distance=function(r,e,t){void 0===t&&(t="lab"),r=new A(r),e=new A(e);var n=r.get(t),a=e.get(t),f=0;for(var o in n){var u=(n[o]||0)-(a[o]||0);f+=u*u}return Math.sqrt(f)},N.limits=Nt.limits,N.valid=function(){for(var r=[],e=arguments.length;e--;)r[e]=arguments[e];try{return new(Function.prototype.bind.apply(A,[null].concat(r))),!0}catch(r){return!1}},N.scales=Ft,N.colors=ye,N.brewer=Lt,N});
diff --git a/htdocs/map.html b/htdocs/map.html
index f09a44a..bd8b60a 100644
--- a/htdocs/map.html
+++ b/htdocs/map.html
@@ -3,6 +3,7 @@
 <head>
     <title>OpenWebRX Map</title>
     <script src="static/lib/jquery-3.2.1.min.js"></script>
+    <script src="static/lib/chroma.min.js"></script>
     <script src="static/map.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
     <link rel="stylesheet" type="text/css" href="static/css/map.css" />
diff --git a/htdocs/map.js b/htdocs/map.js
index 6af68ca..ba7e151 100644
--- a/htdocs/map.js
+++ b/htdocs/map.js
@@ -31,6 +31,34 @@
     var strokeOpacity = 0.8;
     var fillOpacity = 0.35;
 
+    var colorKeys = {};
+    var getColor = function(id){
+        if (!id) return "#000000";
+        if (!colorKeys[id]) {
+            var keys = Object.keys(colorKeys);
+            keys.push(id);
+            keys.sort();
+            var colors = chroma.scale(['#FF0000', '#0000FF']).colors(keys.length);
+            colorKeys = {};
+            keys.forEach(function(key, index) {
+                colorKeys[key] = colors[index];
+            });
+            reColor();
+        }
+        return colorKeys[id];
+    }
+
+    // when the color palette changes, update all grid squares with new color
+    var reColor = function() {
+        $.each(rectangles, function(_, r) {
+            var color = getColor(r.band);
+            r.setOptions({
+                strokeColor: color,
+                fillColor: color
+            });
+        });
+    }
+
     var processUpdates = function(updates) {
         if (!map) {
             updateQueue = updateQueue.concat(updates);
@@ -73,6 +101,7 @@
                     var lon = (loc.charCodeAt(0) - 65 - 9) * 20 + Number(loc[2]) * 2;
                     var center = new google.maps.LatLng({lat: lat + .5, lng: lon + 1});
                     var rectangle;
+                    var color = getColor(update.band);
                     if (rectangles[update.callsign]) {
                         rectangle = rectangles[update.callsign];
                     } else {
@@ -83,9 +112,9 @@
                         rectangles[update.callsign] = rectangle;
                     }
                     rectangle.setOptions($.extend({
-                        strokeColor: '#FF0000',
+                        strokeColor: color,
                         strokeWeight: 2,
-                        fillColor: '#FF0000',
+                        fillColor: color,
                         map: map,
                         bounds:{
                             north: lat,