diff --git a/css/layout.css b/css/layout.css
index 2b915f2..8ebfd8f 100644
--- a/css/layout.css
+++ b/css/layout.css
@@ -179,4 +179,20 @@ header h1{
     padding: 10px;
     border-width: 1px;
     display: none;
+}
+
+#banner {
+    display: none
+}
+@media only screen and (min-width: 768px){
+    #banner {
+        line-height: 1.1;
+        font-size: small;
+        display: block;
+        margin-left: 300px;
+        text-align: center;
+        overflow-y: auto;
+        font-weight: bold;
+        height: 100%;
+    }
 }
\ No newline at end of file
diff --git a/index.template.html b/index.template.html
index 8d3f3b0..0630f4b 100644
--- a/index.template.html
+++ b/index.template.html
@@ -84,6 +84,7 @@
             </ol>
             <span id="locate-me" style="display: none"><i class="icon-target"></i></span>
             <span id="app_name"><b>no<br/>location</b></span>
+            <span id="banner"></span>
         </div>
     </header>
 
@@ -269,13 +270,6 @@ <h4>Visibility</h4>
                     <input type="checkbox" id="opt_hide_chase">
                 </div>
             </div>
-            <div class="row option">
-                <span><b>Show Horizon Rings</b></span>
-                <div class="switch off" id="sw_hide_horizon">
-                    <span class="thumb"></span>
-                    <input type="checkbox" id="opt_hide_horizon">
-                </div>
-            </div>
             <div class="row option">
                 <span><b>Hide Titles</b></span>
                 <div class="switch off" id="sw_hide_titles">
diff --git a/js/app.js b/js/app.js
index 8a2454f..ce08051 100644
--- a/js/app.js
+++ b/js/app.js
@@ -809,7 +809,6 @@ $(window).ready(function() {
         "#sw_hide_chase",
         "#sw_hide_timebox",
         "#sw_hilight_vehicle",
-        '#sw_hide_horizon',
         '#sw_hide_titles',
         '#sw_layers_launches',
         '#sw_selective_sidebar',
@@ -907,14 +906,6 @@ $(window).ready(function() {
                     $('#lookanglesbox').css({top:'40px'});
                 }
                 break;
-            case "opt_hide_horizon":
-                if(on) {
-                    showHorizonRings();
-                }
-                else {
-                    hideHorizonRings();
-                }
-                break;
             case "opt_hide_titles":
                 if(on) {
                     hideTitles();
@@ -1126,6 +1117,19 @@ function update_site(){
     window.location.reload(true)
 }
 
+function check_banner(){
+    const bannerRequest = new Request("https://api.v2.sondehub.org/banner");
+    fetch(bannerRequest)
+        .then(function(response){ return response.json()})
+        .then(function(response){
+            if (response['banner']) {
+                document.getElementsByTagName("header")[0].style.backgroundColor = "#ff6259"
+                document.getElementsByTagName("header")[0].style.borderColor = "#eb3d34"
+                document.getElementById("banner").innerText = response['banner']
+            }
+        })
+}
+
 function update_countdown(){
     var date = new Date(0);
     time_remaining = (reload_end_time - new Date().getTime())/1000
@@ -1135,7 +1139,8 @@ function update_countdown(){
 }
 
 check_version()
+check_banner()
 update_check = setInterval(check_version, 15 * 60 * 1000)
 load_hash();
 startAjax();
-load();
\ No newline at end of file
+load();
diff --git a/js/sondehub.js b/js/sondehub.js
index d29944f..f8b3f4c 100644
--- a/js/sondehub.js
+++ b/js/sondehub.js
@@ -570,7 +570,7 @@ function makeQuad(x, y, zoom) {
 
 // map type list
 
-var osm = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
+var osm = L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
 	maxZoom: 19,
 	attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
 });
@@ -998,27 +998,25 @@ function load() {
     map.on('zoomend', function() {
         sub_to_nearby_sondes();
         //do check for horizon labels
-        if (offline.get("opt_hide_horizon")) {
-            for (key in vehicles) {
-                if (vehicles[key]["vehicle_type"] == "balloon") {
-                    if (vehicles[key]["horizon_circle"]["_map"]) 
-                    {
-                        try {
-                            var zoom = map.getZoom();
-                            var horizonzoom = (Math.abs(Math.log(vehicles[key]["horizon_circle"].getRadius()/2000000)/0.75));
-                            var subhorizonzoom = (Math.abs(Math.log(vehicles[key]["subhorizon_circle"].getRadius()/2000000)/0.75));
-                            if (horizonzoom > zoom) {
-                                map.removeLayer(vehicles[key]["horizon_circle_title"]);
-                            } else {
-                                map.addLayer(vehicles[key]["horizon_circle_title"]);
-                            }
-                            if (subhorizonzoom > zoom) {
-                                map.removeLayer(vehicles[key]["subhorizon_circle_title"]);
-                            } else {
-                                map.addLayer(vehicles[key]["subhorizon_circle_title"]);
-                            }
-                        } catch(e){};
-                    }
+        for (key in vehicles) {
+            if (vehicles[key]["vehicle_type"] == "balloon") {
+                if (vehicles[key]["horizon_circle"]["_map"]) 
+                {
+                    try {
+                        var zoom = map.getZoom();
+                        var horizonzoom = (Math.abs(Math.log(vehicles[key]["horizon_circle"].getRadius()/2000000)/0.75));
+                        var subhorizonzoom = (Math.abs(Math.log(vehicles[key]["subhorizon_circle"].getRadius()/2000000)/0.75));
+                        if (horizonzoom > zoom) {
+                            map.removeLayer(vehicles[key]["horizon_circle_title"]);
+                        } else {
+                            map.addLayer(vehicles[key]["horizon_circle_title"]);
+                        }
+                        if (subhorizonzoom > zoom) {
+                            map.removeLayer(vehicles[key]["subhorizon_circle_title"]);
+                        } else {
+                            map.addLayer(vehicles[key]["subhorizon_circle_title"]);
+                        }
+                    } catch(e){};
                 }
             }
         }
@@ -1564,6 +1562,7 @@ function stopFollow(no_data_reset) {
 	if(follow_vehicle !== null) {
         if(!no_data_reset) {
             focusVehicle(null);
+            hideHorizonRings();
 
             // remove target mark
             $("#main .row.follow").removeClass("follow");
@@ -1612,6 +1611,7 @@ function followVehicle(vcallsign, noPan, force) {
 
 		follow_vehicle = vcallsign;
 		vehicles[follow_vehicle].follow = true;
+        updateHorizonVisibility();
 
         // add target mark
         $("#main .row.follow").removeClass("follow");
@@ -1894,8 +1894,9 @@ function updateVehicleInfo(vcallsign, newPosition) {
                 }
             }
             if(newPosition.callsign[callsign].hasOwnProperty('frequency')){
-                if(newPosition.callsign[callsign].frequency){
-                    vehicle.receiver_info[i].frequency = newPosition.callsign[rxcall].frequency.toFixed(4)
+                const freq = Number(newPosition.callsign[rxcall].frequency);
+                if(!Number.isNaN(freq)){
+                    vehicle.receiver_info[i].frequency = freq.toFixed(4)
                 }
             }
             return
@@ -1913,8 +1914,9 @@ function updateVehicleInfo(vcallsign, newPosition) {
         }
     }
     if(newPosition.callsign[callsign].hasOwnProperty('frequency')){
-        if(newPosition.callsign[callsign].frequency){
-            temp_receiver.frequency = newPosition.callsign[rxcall].frequency.toFixed(4)
+        const freq = Number(newPosition.callsign[rxcall].frequency);
+        if(!Number.isNaN(freq)){
+            temp_receiver.frequency = freq.toFixed(4)
         }
     }
     vehicle.receiver_info[callsign] = temp_receiver;
@@ -3305,12 +3307,7 @@ function addPosition(position) {
                 } else {
                     map.addLayer(vehicle.marker.shadow);
 
-                    if(!offline.get('opt_hide_horizon') == false){
-                        map.addLayer(vehicle.horizon_circle);
-                        map.addLayer(vehicle.subhorizon_circle);
-                        map.addLayer(vehicle.horizon_circle_title);
-                        map.addLayer(vehicle.subhorizon_circle_title);
-                    }
+                    updateHorizonVisibility();
 
                     if(mode == "parachute") {
                         img_src = recolorSVG(host_url + markers_url + "parachute.svg", this.balloonColor);
@@ -3379,14 +3376,9 @@ function addPosition(position) {
             horizon_circle_title = new L.Marker(point, {
                 icon: horizon_circle_title_icon,
                 interactive: true,
-                title: "Line-of-right (radio) horizon of the payload"
+                title: "Line-of-sight (radio) horizon of the payload"
             });
 
-            if (offline.get("opt_hide_horizon")) {
-                horizon_circle.addTo(map);
-                horizon_circle_title.addTo(map);
-            }
-
             horizon_circle.on('move', function (e) {
                 try { 
                     var latlng = L.latLng(e.target.getBounds()._southWest.lat, ((e.target.getBounds()._northEast.lng + e.target.getBounds()._southWest.lng)/2));
@@ -3415,11 +3407,6 @@ function addPosition(position) {
                 title: "Payload is greater than 5 degrees above the horizon within this circle, which indicates it should be fairly easily receivable."
             });
 
-            if (offline.get("opt_hide_horizon")) {
-                subhorizon_circle.addTo(map);
-                subhorizon_circle_title.addTo(map);
-            }
-
             subhorizon_circle.on('move', function (e) {
                 try { 
                     var latlng = L.latLng(e.target.getBounds()._southWest.lat, ((e.target.getBounds()._northEast.lng + e.target.getBounds()._southWest.lng)/2));
@@ -3585,6 +3572,7 @@ function addPosition(position) {
         }
         
         vehicles[vcallsign] = vehicle_info;    
+        updateHorizonVisibility();
     }
 
     var vehicle = vehicles[vcallsign];
@@ -5057,17 +5045,21 @@ function hideHorizonRings(){
     }
 }
 
-function showHorizonRings(){
-    for(var vcallsign in vehicles) {
-        if(vehicles[vcallsign].vehicle_type == "balloon"){
-            map.addLayer(vehicles[vcallsign].horizon_circle);
-            map.addLayer(vehicles[vcallsign].subhorizon_circle);
-            vehicles[vcallsign].horizon_circle.fire("move")
-            vehicles[vcallsign].subhorizon_circle.fire("move")
-            map.addLayer(vehicles[vcallsign].horizon_circle_title);
-            map.addLayer(vehicles[vcallsign].subhorizon_circle_title);
-        }
-    }
+function updateHorizonVisibility(){
+    // Only show horizon rings for the sonde we are currently 'following'
+    // (the last selected sonde)
+    hideHorizonRings();
+
+    if (follow_vehicle === null) return;
+    if (!vehicles.hasOwnProperty(follow_vehicle)) return;
+    if (vehicles[follow_vehicle].vehicle_type != "balloon") return;
+
+    map.addLayer(vehicles[follow_vehicle].horizon_circle);
+    map.addLayer(vehicles[follow_vehicle].subhorizon_circle);
+    vehicles[follow_vehicle].horizon_circle.fire("move");
+    vehicles[follow_vehicle].subhorizon_circle.fire("move");
+    map.addLayer(vehicles[follow_vehicle].horizon_circle_title);
+    map.addLayer(vehicles[follow_vehicle].subhorizon_circle_title);
 }
 
 function hideTitles(){
diff --git a/js/station.js b/js/station.js
index 6ad8857..580ee72 100644
--- a/js/station.js
+++ b/js/station.js
@@ -957,6 +957,7 @@ function generateLaunchSites() {
                 
             popupContent += "<br><b>Know when this site launches?</b> Contribute <a href='" + popupLink + "' target='_blank'>here</a>";
             popupContent += "<br><b>Site Code:</b> " + key;
+            popupContent += "<br>Launch times are <a href='https://forecast.weather.gov/glossary.php?word=synop' target='_blank'>synoptic times</a>. Sonde launches may occur up to 1 hr prior to this."
 
             // Generate view historical button
             popupContent += "<br><button id='historicalButton' onclick='historicalLaunchViewer(\"" + key + "\", \"" + launches.getLayerId(marker) + "\")' style='margin-bottom:0;'>Historical</button><img id='historicalButtonLoading' style='width:60px;height:20px;display:none;' src='img/hab-spinner.gif' />";