diff --git a/public_html/images/alt_legend_feet.svg b/public_html/images/alt_legend_feet.svg
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diff --git a/public_html/images/alt_legend_meters.svg b/public_html/images/alt_legend_meters.svg
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\ No newline at end of file
diff --git a/public_html/images/altitude_legend.png b/public_html/images/altitude_legend.png
deleted file mode 100644
index 2562dad..0000000
Binary files a/public_html/images/altitude_legend.png and /dev/null differ
diff --git a/public_html/images/altitude_legend@2x.png b/public_html/images/altitude_legend@2x.png
deleted file mode 100644
index e0b7fdf..0000000
Binary files a/public_html/images/altitude_legend@2x.png and /dev/null differ
diff --git a/public_html/images/altitude_legend@3x.png b/public_html/images/altitude_legend@3x.png
deleted file mode 100644
index 5f6d192..0000000
Binary files a/public_html/images/altitude_legend@3x.png and /dev/null differ
diff --git a/public_html/index.html b/public_html/index.html
index 92d09d9..f882ab9 100644
--- a/public_html/index.html
+++ b/public_html/index.html
@@ -248,7 +248,7 @@
 				<div id="expand_sidebar_control" class="ol-unselectable ol-control">
 					<button id="expand_sidebar_button" title="Expand Sidebar"></button>
 				</div>
-				<div id="altitude_chart" class="ol-unselectable ol-control">
+				<div id="altitude_chart" class="ol-unselectable ol-control altitudeFeet">
 					<button id="altitude_chart_button"></button>
 				</div>
 			</div>
diff --git a/public_html/script.js b/public_html/script.js
index 0dd8a53..524adf6 100644
--- a/public_html/script.js
+++ b/public_html/script.js
@@ -1417,6 +1417,8 @@ function initializeUnitsSelector() {
     var displayUnits = localStorage['displayUnits'];
     DisplayUnits = displayUnits;
 
+    setAltitudeLegend(displayUnits);
+
     // Initialize drop-down
     var unitsSelector = $("#units_selector");
     unitsSelector.val(displayUnits);
@@ -1429,6 +1431,8 @@ function onDisplayUnitsChanged(e) {
     localStorage['displayUnits'] = displayUnits;
     DisplayUnits = displayUnits;
 
+    setAltitudeLegend(displayUnits);
+
     // Update filters
     updatePlaneFilter();
 
@@ -1450,6 +1454,14 @@ function onDisplayUnitsChanged(e) {
     });
 }
 
+function setAltitudeLegend(units) {
+    if (units === 'metric') {
+        $('#altitude_chart_button').addClass('altitudeMeters');
+    } else {
+        $('#altitude_chart_button').removeClass('altitudeMeters');
+    }
+}
+
 function onFilterByAltitude(e) {
     e.preventDefault();
     updatePlaneFilter();
diff --git a/public_html/style.css b/public_html/style.css
index 3b2eb15..2c4a8f8 100644
--- a/public_html/style.css
+++ b/public_html/style.css
@@ -609,18 +609,25 @@ select.error, textarea.error, input.error {
 
 #altitude_chart {
     float: right;
-    width: 502px;
-    height: 18px;
-    right: 40px;
-    bottom: 10px;
+    width: calc(100% - 5px);
+    max-width: 800px;
+    right: 5px;
+    bottom: 35px;
     background-color: transparent !important;
 }
 
 #altitude_chart_button {
-    background-image: url('images/altitude_legend.png');
+    background-image: url('images/alt_legend_feet.svg');
+    background-size: cover;
     background-color: transparent;
-    width: 502px;
-    height: 18px;
+    width: 100%;
+    height: 0;
+    padding: 0;
+    padding-bottom: calc(100% * 18 / 502);
+}
+
+.altitudeMeters {
+    background-image: url('images/alt_legend_meters.svg') !important;
 }
 
 /* Retina 2x images */