diff --git a/img/markers/car-purple.png b/img/markers/car-purple.png
new file mode 100644
index 0000000..a281513
Binary files /dev/null and b/img/markers/car-purple.png differ
diff --git a/img/markers/car-teal.png b/img/markers/car-teal.png
new file mode 100644
index 0000000..f0e6fe8
Binary files /dev/null and b/img/markers/car-teal.png differ
diff --git a/index.html b/index.html
index 082dc5d..874429f 100644
--- a/index.html
+++ b/index.html
@@ -129,6 +129,8 @@ <h2>Contribute</h2>
         <div class="slimContainer">
             <h2><i class="icon-settings rfloat"></i>Settings</h2>
             <hr/>
+            <h4>General</h4>
+            <hr/>
             <div class="row option">
                 <span><b>Interpolate gaps in telemetry</b></span>
                 <div class="switch off" id="sw_interpolate">
@@ -164,6 +166,8 @@ <h2><i class="icon-settings rfloat"></i>Settings</h2>
                     <input type="checkbox" id="opt_hide_timebox">
                 </div>
             </div>
+            <h4>Visibility</h4>
+            <hr/>
             <div class="row option">
                 <span><b>Hide receivers from the map</b></span>
                 <div class="switch off" id="sw_hide_receivers">
@@ -186,14 +190,7 @@ <h2><i class="icon-settings rfloat"></i>Settings</h2>
                 </div>
             </div>
             <div class="row option">
-                <span><b>Highlight selected vehicle</b></span>
-                <div class="switch off" id="sw_hilight_vehicle">
-                    <span class="thumb"></span>
-                    <input type="checkbox" id="opt_hilight_vehicle">
-                </div>
-            </div>
-            <div class="row option">
-                <span><b>Hide Horizon Rings</b></span>
+                <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">
@@ -213,6 +210,15 @@ <h2><i class="icon-settings rfloat"></i>Settings</h2>
                     <input type="checkbox" id="opt_layers_launches">
                 </div>
             </div>
+            <h4>Other</h4>
+            <hr/>
+            <div class="row option">
+                <span><b>Highlight selected vehicle</b></span>
+                <div class="switch off" id="sw_hilight_vehicle">
+                    <span class="thumb"></span>
+                    <input type="checkbox" id="opt_hilight_vehicle">
+                </div>
+            </div>
             <h4>Overlays</h4>
             <hr/>
             <div class="row option">
diff --git a/js/app.js b/js/app.js
index 6afbdcd..573f312 100644
--- a/js/app.js
+++ b/js/app.js
@@ -802,10 +802,10 @@ $(window).ready(function() {
                 break;
             case "opt_hide_horizon":
                 if(on) {
-                    hideHorizonRings();
+                    showHorizonRings();
                 }
                 else {
-                    showHorizonRings();
+                    hideHorizonRings();
                 }
                 break;
             case "opt_hide_titles":
diff --git a/js/chasecar.lib.js b/js/chasecar.lib.js
index 50b05d7..e7c1785 100644
--- a/js/chasecar.lib.js
+++ b/js/chasecar.lib.js
@@ -45,9 +45,9 @@ ChaseCar.updatePosition = function(callsign, position) {
 
 ChaseCar.markRecovered = function(){
 
-    // Distance limits removed 2021-12-04
-    //_run_checks = true;
-    //_range_limit = 200000; // 200 km
+    // Distance limits reinstated 2021-12-04
+    _run_checks = true;
+    _range_limit = 200000; // 200 km
 
     // Get the serial number to be marked recovered
     _serial = $("#pr_serial").val().trim();
@@ -88,33 +88,31 @@ ChaseCar.markRecovered = function(){
         }
 
     } else {
-        // NOTE - Distance checks now removed. 
-
         // Sonde is on the map, so run some additional checks.
         _recov_lat = vehicles[_serial].curr_position['gps_lat'];
         _recov_lon = vehicles[_serial].curr_position['gps_lon'];
 
-        // // Now get the last position of the sonde.
-        // _sonde = {
-        //     'lat':_recov_lat,
-        //     'lon':_recov_lon,
-        //     'alt':0.0
-        // };
-
-        // // Now get the chaser position.
-        // _chaser = {
-        //     'lat': parseFloat($('#cc_lat').text()),
-        //     'lon': parseFloat($('#cc_lon').text()),
-        //     'alt': 0.0
-        // };
-
-        // // Calculate the distance from the sonde
-        // _lookangles = calculate_lookangles(_chaser, _sonde);
-
-        // if( (_lookangles.range > _range_limit ) && _run_checks){
-        //     $('#pr_last_report').text("Outside distance limit.");
-        //     return;
-        // }
+        // Now get the last position of the sonde.
+        _sonde = {
+            'lat':_recov_lat,
+            'lon':_recov_lon,
+            'alt':0.0
+        };
+
+        // Now get the chaser position.
+        _chaser = {
+            'lat': parseFloat($('#cc_lat').text()),
+            'lon': parseFloat($('#cc_lon').text()),
+            'alt': 0.0
+        };
+
+        // Calculate the distance from the sonde
+        _lookangles = calculate_lookangles(_chaser, _sonde);
+
+        if( (_lookangles.range > _range_limit ) && _run_checks){
+            $('#pr_last_report').text("Outside distance limit.");
+            return;
+        }
 
         if($("#sw_use_car_pos").hasClass('on')){
             _recov_lat = parseFloat($('#cc_lat').text());
diff --git a/js/tracker.js b/js/tracker.js
index 1fb47fa..c68462b 100644
--- a/js/tracker.js
+++ b/js/tracker.js
@@ -63,7 +63,7 @@ var graph_vehicle = null;
 var manual_pan = false;
 
 var car_index = 0;
-var car_colors = ["blue", "red", "green", "yellow"];
+var car_colors = ["blue", "red", "green", "yellow", "teal", "purple"];
 var balloon_index = 0;
 var balloon_colors_name = ["red", "blue", "green", "yellow", "purple", "orange", "cyan"];
 var balloon_colors = ["#f00", "blue", "green", "#FDFC30", "#c700e6", "#ff8a0f", "#0fffca"];
@@ -715,7 +715,7 @@ function load() {
 
     map.on('zoomend', function() {
         //do check for horizon labels
-        if (!offline.get("opt_hide_horizon")) {
+        if (offline.get("opt_hide_horizon")) {
             for (key in vehicles) {
                 if (vehicles[key]["vehicle_type"] == "balloon") {
                     if (vehicles[key]["horizon_circle"]["_map"]) 
@@ -3416,7 +3416,7 @@ function addPosition(position) {
                 } else {
                     map.addLayer(vehicle.marker.shadow);
 
-                    if(offline.get('opt_hide_horizon') == false){
+                    if(!offline.get('opt_hide_horizon') == false){
                         map.addLayer(vehicle.horizon_circle);
                         map.addLayer(vehicle.subhorizon_circle);
                         map.addLayer(vehicle.horizon_circle_title);
@@ -3490,7 +3490,7 @@ function addPosition(position) {
                 interactive: false,
             });
 
-            if (!offline.get("opt_hide_horizon")) {
+            if (offline.get("opt_hide_horizon")) {
                 horizon_circle.addTo(map);
                 horizon_circle_title.addTo(map);
             }
@@ -3522,7 +3522,7 @@ function addPosition(position) {
                 interactive: false,
             });
 
-            if (!offline.get("opt_hide_horizon")) {
+            if (offline.get("opt_hide_horizon")) {
                 subhorizon_circle.addTo(map);
                 subhorizon_circle_title.addTo(map);
             }
@@ -5372,7 +5372,6 @@ function refreshUI() {
     if(follow_vehicle !== null) update_lookangles(follow_vehicle);
 }
 
-
 function hideHorizonRings(){
     for(var vcallsign in vehicles) {
         if(vehicles[vcallsign].vehicle_type == "balloon"){
@@ -5383,6 +5382,7 @@ function hideHorizonRings(){
         }
     }
 }
+
 function showHorizonRings(){
     for(var vcallsign in vehicles) {
         if(vehicles[vcallsign].vehicle_type == "balloon"){
@@ -5401,6 +5401,7 @@ function hideTitles(){
         }
     }
 }
+
 function showTitles(){
     for(var vcallsign in vehicles) {
         if(vehicles[vcallsign].vehicle_type == "balloon" || vehicles[vcallsign].vehicle_type == "car"){