diff --git a/d3nav/client/d3js/d3.v4.4.0.min.js b/d3nav/client/d3js/d3.v4.4.0.min.js
new file mode 100644
index 0000000..ca16dcf
--- /dev/null
+++ b/d3nav/client/d3js/d3.v4.4.0.min.js
@@ -0,0 +1,8 @@
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diff --git a/d3nav/client/d3nav-demo.html b/d3nav/client/d3nav-demo.html
new file mode 100644
index 0000000..4548aba
--- /dev/null
+++ b/d3nav/client/d3nav-demo.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<html>
+<!-- include CSS first, then external JS -->
+<link rel="stylesheet" type="text/css" href="style/windinstrument.css">
+<script src="d3js/d3.v4.4.0.min.js"></script>
+<script src="js/windinstrument.js"></script>
+<style>
+
+body {
+	background: black;
+	font-family: sans-serif;
+	font-style: italic;
+}
+
+div {
+	background-color: black;
+	float: left;
+}
+
+svg {
+	font-family: sans-serif; 
+}
+</style>
+
+<body>
+
+<div id="ins_1" width="400" height="300"></div>
+<div id="ins_2" width="200" height="200"></div>
+
+<script>
+
+var AWA = new AppWindInstrument(d3.select("#ins_1"));
+var TWA = new TrueWindInstrument(d3.select("#ins_2"));
+
+function read_data_log() {
+	AWA.update_as_1(Math.random()*120-60, Math.random()*40);
+	AWA.update_as_5(Math.random()*120-60, Math.random()*40);
+	AWA.update_as_15(Math.random()*120-60, Math.random()*40);
+	TWA.update_as_1(Math.random()*120-60, Math.random()*40);
+	TWA.update_as_5(Math.random()*120-60, Math.random()*40);
+	TWA.update_as_15(Math.random()*120-60, Math.random()*40);
+}
+
+function read_data() {
+	AWA.update_as(Math.random()*120-60, Math.random()*40);
+	TWA.update_as(Math.random()*120-60, Math.random()*40);
+}
+
+// Init
+read_data();
+read_data_log();
+
+// Update every 3/12 seconds
+setInterval(read_data, 3000);
+setInterval(read_data_log, 12000);
+
+</script>
+
+</body>
+</html>
+
diff --git a/d3nav/client/js/windinstrument.js b/d3nav/client/js/windinstrument.js
new file mode 100644
index 0000000..db1a89c
--- /dev/null
+++ b/d3nav/client/js/windinstrument.js
@@ -0,0 +1,104 @@
+// Wind instrument (analog dial)
+
+class WindInstrument {
+
+	// Constructor defines geometry constants based on the container's dimensions
+	// Adds an SVG to the container
+	constructor(container, ID, unit = "kt") {
+		this.margin = {top:6, left:6, bottom:6, right:6 };
+		this.ID = ID;
+		this.unit = unit;
+		this.s = container.append("svg");
+		this.s.attr("width", container.attr("width"));
+		this.s.attr("height",container.attr("height"));
+		// Geometry
+		this.centerx = (this.s.attr("width")-this.margin.left-this.margin.right)/2+this.margin.left;
+		this.centery = (this.s.attr("height")-this.margin.top-this.margin.bottom)/2+this.margin.top;
+		this.maxradius = Math.min((this.s.attr("width")-this.margin.left-this.margin.right)/2, (this.s.attr("height")-this.margin.top-this.margin.bottom)/2);
+		this.init_instrument();
+	}
+
+	init_instrument() {
+		// Define some constants for dial, ticks, etc.
+		var translate_to = "translate(" + this.centerx + "," + this.centery + ")";
+		var dialradius = this.maxradius;
+		var degreeTickStart = this.maxradius-2; 
+		var degreeTickLength = -6;
+
+		// Add SVG group for the dial and add graphical elements
+		// For this group, the center of the SVG is now the reference (i.e x=0, y=0)
+		var dial = this.s.append("g").attr("id", "dial").attr("transform", translate_to);
+		// Add main dial background
+		dial.append("circle").attr("class", "dial").attr("r", dialradius).attr("class", "instrument-bg");
+		// Add instrument ID
+		dial.append('text').attr('class', 'instrument-id').attr('text-anchor','middle').attr('x',0).attr('y',-30).text(this.ID);
+		// Add ticks (one every 10°, -40° to 40° ticks are different for clause hauled reach)
+		dial.selectAll('.dial-tick')
+			.data(d3.range(-180,180, 10))
+			.enter()
+			.append('line')
+			.attr('class', function(d) { if (Math.abs(d)>=140) return 'dial-tick '; else return 'dial-tick';})
+			.attr('x1',0).attr('x2',0)
+			.attr('y1',degreeTickStart).attr('y2',degreeTickStart + degreeTickLength)
+			.attr('transform', function(d) { return 'rotate(' + d + ')';});
+		// Add degrees labels - one every 30° - port and stb are red and green
+		dial.selectAll('.degree-label')
+			.data(d3.range(-150,181,30))
+			.enter()
+			.append('text')
+			.attr('class', function(d) { if (d==0 || d==180) { return 'degree-label'; } else if (d<0) { return 'degree-label port'; } else { return 'degree-label starbord'; } })
+			.attr('text-anchor','middle')
+			.attr('x',function(d) { return  dialradius*0.8*Math.sin(d/360*(2*Math.PI)); })
+			.attr('y',function(d) { return -dialradius*0.8*Math.cos(d/360*(2*Math.PI))+3; })
+			.text(function(d) { return Math.abs(d); });
+
+		// Add SVG group for the hands (current, 1 minute, 5 minutes and 15 minutes) and add graphical elements
+		// For this group, the center of the SVG is now the reference (i.e x=0, y=0)
+		var hands = this.s.append("g").attr("id", "hands").attr("transform", translate_to);
+
+		hands.append('line').attr('class', 'wa-hand-15').attr('x1',0).attr('y1',0).attr('x2',0).attr('y2', -dialradius*0.8);
+		hands.append('line').attr('class', 'wa-hand-5').attr('x1',0).attr('y1',0).attr('x2',0).attr('y2', -dialradius*0.8);
+		hands.append('line').attr('class', 'wa-hand-1').attr('x1',0).attr('y1',0).attr('x2',0).attr('y2', -dialradius*0.8);
+		hands.append('line').attr('class', 'wa-hand').attr('x1',0).attr('y1',0).attr('x2',0).attr('y2', -dialradius);
+
+
+		// Add SVG group for the digits (current only) and add graphical elements
+		// For this group, the center of the SVG is now the reference (i.e x=0, y=0)
+		var digit = this.s.append("g").attr("id", "digits").attr("transform", translate_to);
+		digit.append('text').attr('class', 'ws-digit').attr('text-anchor','middle').attr('x',0).attr('y',30).text("-- kt");
+	}
+
+	// Generic update method
+	update(angle, hand_class, speed, digit_class = null) {
+		// Make hand visible if needed
+		var hand = this.s.select(hand_class);
+		hand.style('visibility', 'visible');
+
+		// Round speed and update digits
+		if (speed < 15) speed = Math.round(speed*10)/10;
+		else speed = Math.round(speed);
+		if (digit_class) this.s.select(digit_class).text(speed+' '+this.unit); 
+		
+		// Update hand (color and angle)
+		var ramp = d3.scaleLinear().domain([0,15,40]).range(["green", "yellow", "red"]);
+		hand.transition().duration(500).style("stroke", ramp(speed)).attr('transform', 'rotate('+ angle +')');
+	}
+
+	// Specific update methods (for each hand)
+	update_as(angle, speed)		{ this.update(angle, '.wa-hand', speed, '.ws-digit'); }
+	update_as_1(angle, speed)	{ this.update(angle, '.wa-hand-1', speed); }
+	update_as_5(angle, speed)	{ this.update(angle, '.wa-hand-5', speed); }
+	update_as_15(angle, speed)	{ this.update(angle, '.wa-hand-15', speed); }
+}
+
+// True Wind Instrument
+class TrueWindInstrument extends WindInstrument {
+	constructor(container) { super(container, 'TRU'); }
+}
+
+// True Wind Instrument
+class AppWindInstrument extends WindInstrument {
+	constructor(container) { super(container, 'APP'); }
+}
+
+// EOF
diff --git a/d3nav/client/style/windinstrument.css b/d3nav/client/style/windinstrument.css
new file mode 100644
index 0000000..6a5c893
--- /dev/null
+++ b/d3nav/client/style/windinstrument.css
@@ -0,0 +1,68 @@
+.dial-tick {
+	stroke:grey;
+	stroke-width:3;
+	fill:grey;
+	stroke-linecap:round;
+}
+
+.degree-label {
+	stroke:grey;
+	fill:grey;
+	font-size:16;
+}
+
+.instrument-bg {
+	fill: #000;
+}
+
+.port {
+	stroke: red;
+	fill: red;
+}
+
+.starbord {
+	stroke: green;
+	fill: green;
+}
+
+.wa-hand {
+	stroke:grey;
+	stroke-width:12;
+	stroke-opacity:0.8;
+	stroke-linecap:round;
+	visibility:visible;
+}
+
+.wa-hand-1 {
+	stroke:white;
+	stroke-width:10;
+	stroke-opacity:0.6;
+	stroke-linecap:round;
+	visibility:hidden;
+}
+
+.wa-hand-5 {
+	stroke:white;
+	stroke-width:8;
+	stroke-opacity:0.5;
+	stroke-linecap:round;
+	visibility:hidden;
+}
+
+.wa-hand-15 {
+	stroke:white;
+	stroke-width:6;
+	stroke-opacity:0.4;
+	stroke-linecap:round;
+	visibility:hidden;
+}
+
+.ws-digit {
+	stroke:orange;
+	fill:orange;
+}
+
+.instrument-id {
+	stroke:none;
+	fill:white;
+}