diff --git a/htdocs/lib/MapMarkers.js b/htdocs/lib/MapMarkers.js
index 8a3d1d19..d95b622c 100644
--- a/htdocs/lib/MapMarkers.js
+++ b/htdocs/lib/MapMarkers.js
@@ -189,9 +189,9 @@ Marker.makeListTitle = function(name) {
 
 // Convert given name/value to an information section item.
 Marker.makeListItem = function(name, value) {
-    return '<div style="border-bottom:1px dotted;white-space:nowrap;">'
+    return '<div style="display:flex;justify-content: space-between;border-bottom:1px dotted;white-space:nowrap;">'
         + '<span>' + name + '&nbsp;&nbsp;&nbsp;&nbsp;</span>'
-        + '<span style="float:right;">' + value + '</span>'
+        + '<span>' + value + '</span>'
         + '</div>';
 };
 
@@ -252,6 +252,12 @@ FeatureMarker.prototype.update = function(update) {
     this.status   = update.location.status;
     this.updated  = update.location.updated;
     this.mmode    = update.location.mmode;
+    var detailsObj = {};
+    var detailsKeys = Object.keys(update.location).filter(function (k) {return k.startsWith('details_')});
+    detailsKeys.forEach(function (d) {
+        detailsObj[d.substring(8)] = update.location[d];
+    });
+    this.detailsData = detailsObj;
 
     // Implementation-dependent function call
     this.setMarkerPosition(update.callsign, update.location.lat, update.location.lon);
@@ -340,6 +346,11 @@ FeatureMarker.prototype.getInfoHTML = function(name, receiverMarker = null) {
         }
     }
 
+    var markerExtra = this.detailsData;
+    Object.keys(this.detailsData).sort().forEach(function (k, i) {
+        detailsString += Marker.makeListItem(k.charAt(0).toUpperCase() + k.slice(1), markerExtra[k]);
+    });
+
     if (this.schedule) {
         for (var j=0 ; j<this.schedule.length ; ++j) {
             var freq = this.schedule[j].freq;