diff --git a/net_io.c b/net_io.c
index bff640f..1fa32f1 100644
--- a/net_io.c
+++ b/net_io.c
@@ -373,6 +373,7 @@ static void modesSendBeastOutput(struct modesMessage *mm) {
     char *p = prepareWrite(&Modes.beast_out, 2 + 2 * (7 + msgLen));
     char ch;
     int  j;
+    int sig;
     unsigned char *msg = (Modes.net_verbatim ? mm->verbatim : mm->msg);
 
     if (!p)
@@ -402,7 +403,12 @@ static void modesSendBeastOutput(struct modesMessage *mm) {
     *p++ = (ch = (mm->timestampMsg));
     if (0x1A == ch) {*p++ = ch; }
 
-    *p++ = ch = (char) round(sqrt(mm->signalLevel) * 255);
+    sig = round(sqrt(mm->signalLevel) * 255);
+    if (mm->signalLevel > 0 && sig < 1)
+        sig = 1;
+    if (sig > 255)
+        sig = 255;
+    *p++ = ch = (char)sig;
     if (0x1A == ch) {*p++ = ch; }
 
     for (j = 0; j < msgLen; j++) {
@@ -729,8 +735,8 @@ static int decodeBinMessage(struct client *c, char *p) {
         clock_gettime(CLOCK_REALTIME, &mm.sysTimestampMsg);
 
         ch = *p++;  // Grab the signal level
-        mm.signalLevel = ((unsigned char)ch / 256.0);
-        mm.signalLevel = mm.signalLevel * mm.signalLevel + 1e-5;
+        mm.signalLevel = ((unsigned char)ch / 255.0);
+        mm.signalLevel = mm.signalLevel * mm.signalLevel;
         if (0x1A == ch) {p++;}
 
         for (j = 0; j < msgLen; j++) { // and the data
@@ -797,7 +803,7 @@ static int decodeHexMessage(struct client *c, char *hex) {
     // Mark messages received over the internet as remote so that we don't try to
     // pass them off as being received by this instance when forwarding them
     mm.remote      =    1;
-    mm.signalLevel =    1e-5;
+    mm.signalLevel =    0;
 
     // Remove spaces on the left and on the right
     while(l && isspace(hex[l-1])) {
@@ -814,8 +820,8 @@ static int decodeHexMessage(struct client *c, char *hex) {
 
     switch(hex[0]) {
         case '<': {
-            mm.signalLevel = ((hexDigitVal(hex[13])<<4) | hexDigitVal(hex[14])) / 256.0;
-            mm.signalLevel = mm.signalLevel * mm.signalLevel + 1e-5;
+            mm.signalLevel = ((hexDigitVal(hex[13])<<4) | hexDigitVal(hex[14])) / 255.0;
+            mm.signalLevel = mm.signalLevel * mm.signalLevel;
             hex += 15; l -= 16; // Skip <, timestamp and siglevel, and ;
             break;}
 
diff --git a/public_html/index.html b/public_html/index.html
index 670b698..78a03fb 100644
--- a/public_html/index.html
+++ b/public_html/index.html
@@ -5,7 +5,7 @@
 		<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
 		<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
 		<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>
-		<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false&amp;libraries=geometry"></script>
+		<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
 		<script type="text/javascript" src="config.js"></script>
 		<script type="text/javascript" src="markers.js"></script>
 		<script type="text/javascript" src="dbloader.js"></script>
@@ -56,7 +56,7 @@
                                         <b id="infoblock_name">Piaware</b>
                                       </td>
                                       <td align="right">
-                                        <a href="https://github.com/mutability/dump1090" id="dump1090_version" target="_blank"></span>
+                                        <a href="https://github.com/mutability/dump1090" id="dump1090_version" target="_blank"></a>
                                       </td>
                                     </tr>
 
@@ -128,7 +128,7 @@
 
                                     <tr class="infoblock_body">
                                       <td>Track: <span id="selected_track">n/a</span></td>
-	                              <td>Last seen: <span id="selected_seen">n/a</span</td>
+	                              <td>Last seen: <span id="selected_seen">n/a</span></td>
                                     </tr>
 
                                     <tr class="infoblock_body">
@@ -143,6 +143,7 @@
 				<div id="planes_table">
 	                          <table id="tableinfo" width="100%">
 	                            <thead style="background-color: #BBBBBB; cursor: pointer;">
+                                 <tr>
 	                              <td id="icao" onclick="sortByICAO();">ICAO</td>
                                       <td id="flag" onclick="sortByCountry()"><!-- column for flag image --></td>
 				      <td id="flight" onclick="sortByFlight();">Flight</td>
@@ -153,6 +154,7 @@
                                       <td id="track" onclick="sortByTrack();" align="right">Track</td>
 	                              <td id="msgs" onclick="sortByMsgs();" align="right">Msgs</td>
 	                              <td id="seen" onclick="sortBySeen();" align="right">Age</td>
+                                 </tr>
                                     </thead>
                                     <tbody>
                                       <tr id="plane_row_template" class="plane_table_row hidden">
diff --git a/public_html/script.js b/public_html/script.js
index ce21e36..823f228 100644
--- a/public_html/script.js
+++ b/public_html/script.js
@@ -894,10 +894,11 @@ function resetMap() {
 function drawCircle(marker, distance) {
     if (typeof distance === 'undefined') {
         return false;
-        
-        if (!(!isNaN(parseFloat(distance)) && isFinite(distance)) || distance < 0) {
-            return false;
-        }
+    }
+
+    distance = parseFloat(distance);
+    if (isNaN(distance) || !isFinite(distance) || distance < 0) {
+        return false;
     }
     
     distance *= 1000.0;
diff --git a/track.c b/track.c
index 8d1a4d0..4fc7763 100644
--- a/track.c
+++ b/track.c
@@ -66,8 +66,8 @@ struct aircraft *trackCreateAircraft(struct modesMessage *mm) {
     // Now initialise things that should not be 0/NULL to their defaults
     a->addr = mm->addr;
     for (i = 0; i < 8; ++i)
-        a->signalLevel[i] = mm->signalLevel;  // First time, initialise everything
-                                              // to the first signal strength
+        a->signalLevel[i] = 1e-5;
+    a->signalNext = 0;
 
     // mm->msgtype 32 is used to represent Mode A/C. These values can never change, so 
     // set them once here during initialisation, and don't bother to set them every 
@@ -478,7 +478,10 @@ struct aircraft *trackUpdateFromMessage(struct modesMessage *mm)
         Modes.aircrafts = a;
     }
 
-    a->signalLevel[a->messages & 7] = mm->signalLevel;// replace the 8th oldest signal strength
+    if (mm->signalLevel > 0) {
+        a->signalLevel[a->signalNext] = mm->signalLevel;
+        a->signalNext = (a->signalNext + 1) & 7;
+    }
     a->seen      = now;
     a->messages++;
 
diff --git a/track.h b/track.h
index 9153050..21becb5 100644
--- a/track.h
+++ b/track.h
@@ -64,6 +64,7 @@ struct aircraft {
     uint32_t      addr;           // ICAO address
     char          flight[16];     // Flight number
     double        signalLevel[8]; // Last 8 Signal Amplitudes
+    int           signalNext;     // next index of signalLevel to use
     int           altitude;       // Altitude (Baro)
     int           altitude_hae;   // Altitude (HAE)
     int           hae_delta;      // Difference between HAE and Baro altitudes