diff --git a/public_html/formatter.js b/public_html/formatter.js
index 2aca7df..191364b 100644
--- a/public_html/formatter.js
+++ b/public_html/formatter.js
@@ -92,6 +92,17 @@ function format_altitude_long(alt, vr, displayUnits) {
 	}
 }
 
+// alt ground/airborne
+function format_onground (alt) {
+	if (alt === null) {
+		return "n/a";
+	} else if (alt === "ground") {
+		return "on ground";
+	} else {
+		return "airborne";
+	}
+}
+
 // alt in feet
 function convert_altitude(alt, displayUnits) {
 	if (displayUnits === "metric") {
diff --git a/public_html/index.html b/public_html/index.html
index 14d4789..9156d14 100644
--- a/public_html/index.html
+++ b/public_html/index.html
@@ -272,13 +272,13 @@
 							<div class="infoblock-container">
 
 							<div class="highlightedTitle">
-								<span class="identLarge"><span id="selected_callsign">n/a</span></span>
-								<span class="identSmall"><span id="selected_icao">n/a</span></span>
+								<span class="identLarge" title="Typically the air traffic control callsign or the aircraft's registration, as entered into the transponder by the pilot."><span id="selected_callsign">n/a</span></span>
+								<span class="identSmall" title="The aircraft's unique ICAO identification number shown in hexadecimal format."><span id="selected_icao">n/a</span></span>
 							</div>
 						
 								<div class="infoBlockTopSection">
 									<div class="infoRow removePadding">
-										<div class="infoHeading infoRowFluid">Registration: </div>
+										<div class="infoHeading infoRowFluid"><span title="The alphanumeric registration code assigned by the country in which the aircraft is registered.">Registration</span>: </div>
 										<div class="infoData infoRowFluid"><span id="selected_registration">n/a</span></div>
 									</div>
 									<div class="infoRow removePadding">
@@ -325,7 +325,7 @@
 									</div>
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection3">
-											<span title="Whether the aircraft is reporting it is on the ground of airborne.">Air/Ground Status</span>:
+											<span title="Whether the aircraft is reporting it is on the ground or airborne.">Air/Ground Status</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection4">
 											<span id="selected_onground">n/a</span>
@@ -477,7 +477,7 @@
 								<div class="infoBlockSection">
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection1">
-											<span title="The selected altitude in the aircraft's flight management system.">Nav Altitude</span>:
+											<span title="The selected altitude in the aircraft's flight management system.">Altitude</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection2">
 											<span id="selected_nav_altitude">n/a</span>
@@ -485,7 +485,7 @@
 									</div>
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection1">
-											<span title="The enabled navigation modes as reported by the aircraft (i.e., auto-pilot, Traffic Collision Avoidance System, altitude hold, approach, LNAV approach, and/or VNAV approach).">Nav Modes</span>:
+											<span title="The enabled navigation modes as reported by the aircraft (i.e., auto-pilot, Traffic Collision Avoidance System, altitude hold, approach, LNAV approach, and/or VNAV approach).">Modes</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection2">
 											<span id="selected_nav_modes">n/a</span>
@@ -493,7 +493,7 @@
 									</div>
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection1">
-											<span title="The selected heading in the aircraft's flight management system.">Nav Heading</span>:
+											<span title="The selected heading in the aircraft's flight management system.">Heading</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection2">
 											<span id="selected_nav_heading">n/a</span>
@@ -501,7 +501,7 @@
 									</div>
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection1">
-											<span title="The altimeter/QNH setting used by the aircraft's navigation systems.">Nav QNH</span>:
+											<span title="The altimeter/QNH setting used by the aircraft's navigation systems.">QNH</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection2">
 											<span id="selected_nav_qnh">n/a</span>
@@ -549,7 +549,7 @@
 									</div>
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection1">
-											Category:
+											<span title="Aircraft category code as reported by the aircraft. This indicates the type of aircraft and, for airplanes, a relative indicator of its size.">Category</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection2">
 											<span id="selected_category">n/a</span>
@@ -557,7 +557,7 @@
 									</div>
 									<div class="infoRowLine">
 										<div class="infoHeading infoRowFluid fourColumnSection1">
-											Last Seen:
+											<span title="The last time your ADS-B site received a message from the aircraft.">Last Seen</span>:
 										</div>
 										<div class="infoData infoRowFluid fourColumnSection2">
 											<span id="selected_seen">n/a</span>
diff --git a/public_html/script.js b/public_html/script.js
index a2b6d91..7732ea5 100644
--- a/public_html/script.js
+++ b/public_html/script.js
@@ -930,6 +930,8 @@ function refreshSelected() {
 
 		$("#selected_altitude").text(format_altitude_long(selected.altitude, selected.vert_rate, DisplayUnits));
 
+		$('#selected_onground').text(format_onground(selected.altitude));
+
         if (selected.squawk === null || selected.squawk === '0000') {
                 $('#selected_squawk').text('n/a');
         } else {