diff --git a/static/scripts/viz/trackster/tracks.js b/static/scripts/viz/trackster/tracks.js
index 914a6c8d872..ed683c69c2b 100644
--- a/static/scripts/viz/trackster/tracks.js
+++ b/static/scripts/viz/trackster/tracks.js
@@ -1091,8 +1091,7 @@ var TracksterView = Backbone.View.extend({
             }
         });
        
-        // Dragging in the top label track allows selecting a region
-        // to zoom in 
+        // Dragging in the top label track allows selecting a region to zoom in on selected region.
         this.top_labeltrack.bind( "dragstart", function( e, d ) {
             return $("<div/>").addClass('zoom-area').css(
                 "height", view.browser_content_div.height() + view.top_labeltrack.height() + view.nav_labeltrack.height() + 1
@@ -1116,6 +1115,27 @@ var TracksterView = Backbone.View.extend({
             $(d.proxy).remove();
             view.request_redraw();
         });
+
+        // For vertical alignment, track mouse with simple line.
+        var mouse_tracker_div = $('<div/>').addClass('mouse-pos').appendTo(parent_element);
+
+        // Show tracker only when hovering over view.
+        parent_element.hover(
+            function() {
+                mouse_tracker_div.show();
+                parent_element.mousemove(function(e) {
+                    mouse_tracker_div.css({
+                        // -1 makes it appear next to the mouse w/o obscuring clicking
+                        // and dragging on view elements.
+                        left: e.pageX - 1
+                    });
+                });
+            },
+            function() {
+                parent_element.off('mousemove');
+                mouse_tracker_div.hide();
+            }
+        );
         
         this.add_label_track( new LabelTrack( this, { content_div: this.top_labeltrack } ) );
         this.add_label_track( new LabelTrack( this, { content_div: this.nav_labeltrack } ) );
diff --git a/static/style/blue/trackster.css b/static/style/blue/trackster.css
index fb463471e8e..cecff6b40c9 100644
--- a/static/style/blue/trackster.css
+++ b/static/style/blue/trackster.css
@@ -79,5 +79,6 @@ input.color-input{float:left}
 .feature-popup{position:absolute;z-index:2;padding:5px;font-size:10px;filter:alpha(opacity=80);background-repeat:no-repeat;background-image:url(../images/tipsy.gif);background-position:top center}
 .feature-popup-inner{padding:5px 8px 4px 8px;background-color:black;color:white}
 .zoom-area{position:absolute;top:0px;background-color:#ccf;opacity:0.5;z-index:2}
+.mouse-pos{position:absolute;top:0px;background-color:black;opacity:0.15;height:100%;width:1px}
 .draghandle{margin-top:2px;cursor:move;float:left;background:transparent url(../images/visualization/draggable_horizontal.png) center center no-repeat;width:10px;height:12px}
 .dragging{border:1px solid blue}
diff --git a/static/style/src/less/trackster.less b/static/style/src/less/trackster.less
index 89efaa6f503..c615e8f6de0 100644
--- a/static/style/src/less/trackster.less
+++ b/static/style/src/less/trackster.less
@@ -531,6 +531,15 @@ input {
     z-index: @overlay-index; 
 }
 
+.mouse-pos {
+    position: absolute;
+    top: 0px;
+    background-color: black;
+    opacity: 0.15;
+    height: 100%;
+    width: 1px;
+}
+
 .draghandle {
     margin-top: 2px;
     cursor: move;