h:En:OpenSeaMap in Website

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You can include OpenSeaMap in various ways to the website:

Embed as Static Map

Static Map

The easiest way you show a static image, and link it with the full map of OpenSeaMap:

  1. Search in OpenSeaMap the appropriate map section
  2. Press the key Print, so you copy the whole screen
    with the key combination <Alt-Print> you can selectively copy the currently active window
  3. Open an image editing program of your choice and add the screenshot with <Strg-v>
  4. Draw the desired information (text, lines, circles, areas)
  5. Save the image on your computer
  6. Load the image to your Web server
  7. Include the uploaded image in the article:
<img src="Path/Filename_of_Image" alt="Alternative_text" width="Width" height="Height">
Link a static map to the full screen map

<imagemap> Image:MapFullscreen.png|right|thumb|200px|with Link to Fullscreen Chart default [1] desc none </imagemap>

You can link the map directly to OpenSeaMap. So by clicking on the map you opens the fullscreen map of OpenSeaMap in a new window. There you can zoom and move freely:

  1. Search in OpenSeaMap the appropriate map section
  2. Copy the permalink (on the map bottom right) by <Ctrl-c>
  3. Add the full permalink to your code by <Strg-v>
<a href="Permalink">
<img src="Path/Fileame_of_Image" alt="Alternative text" width="Width" height="Height">


<a href="http://www.openseamap.org/map/?zoom=18&lat=54.18171&lon=12.08555&layers=BFTTFFTFFTF0FF&lang=de">
<img src="../MapFullscreen.png" alt="show 'Teepott Warnemünde' to the chart" width="200" height="133">

Marker with speech bubble
Fullscreen chart with Marker and speech bubble

HoTo for displaying a marker plus text in a speech bubble

Embed as Slippy-Map

You can embed OpenSeaMap also dynamically on the site. Users will see your chosen section and the appropriate zoom level in the first load. He can zoom and move freely.

<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" 
style="border: 1px solid black"></iframe>
<a href="http://www.openseamap.org/?lat=48.25&lon=5.92&zoom=5&layers=BFTTFFTFFTF0FF">Größere Karte anzeigen</a>

The yellow-marked values of the variables have the following meaning:

width With of the chart (pixel)
height Height of the chart (pixel)
bbox "Bounding-Box" (the 4 corners of the selected chart)
lat Latitude of the chart center
lat Longitude of the chart center
zoom Zoomlevel of the chart (4...18)

HTML code to embed in the map:

		<meta http-equiv="content-type" content="text/html; charset=utf-8"/>

		<style type="text/css">
			.olImageLoadError {
				display: none !important;

		<!-- bring in the OpenLayers javascript library
			(here we bring it from the remote site, but you could
			easily serve up this javascript yourself) -->
		<script src="http://www.openlayers.org/api/OpenLayers.js"></script>

		<!-- bring in the OpenStreetMap OpenLayers layers.
			Using this hosted file will make sure we are kept up
			to date with any necessary changes -->
		<script src="http://www.openstreetmap.org/openlayers/OpenStreetMap.js"></script>
		<script type="text/javascript" src="http://map.openseamap.org/map/javascript/harbours.js"></script>
		<script type="text/javascript" src="http://map.openseamap.org/map/javascript/map_utils.js"></script>
		<script type="text/javascript" src="http://map.openseamap.org/map/javascript/utilities.js"></script>
		<script type="text/javascript">

			var map;
			var layer_mapnik;
			var layer_tah;
			var layer_seamark;
			var marker;

			// Position and zoomlevel of the map
			var lon = 12.0915;
			var lat = 54.1878;
			var zoom = 15;
			var linkTextSkipperGuide = "Beschreibung auf SkipperGuide";
			var linkTextWeatherHarbour = "Meteogramm";
			var language = 'de';

			function jumpTo(lon, lat, zoom) {
				var x = Lon2Merc(lon);
				var y = Lat2Merc(lat);
				map.setCenter(new OpenLayers.LonLat(x, y), zoom);
				return false;

			function Lon2Merc(lon) {
				return 20037508.34 * lon / 180;

			function Lat2Merc(lat) {
				var PI = 3.14159265358979323846;
				lat = Math.log(Math.tan( (90 + lat) * PI / 360)) / (PI / 180);
				return 20037508.34 * lat / 180;

			function addMarker(layer, lon, lat, popupContentHTML) {
				var ll = new OpenLayers.LonLat(Lon2Merc(lon), Lat2Merc(lat));
				var feature = new OpenLayers.Feature(layer, ll);
				feature.closeBox = true;
				feature.popupClass = OpenLayers.Class(OpenLayers.Popup.FramedCloud, {minSize: new OpenLayers.Size(260, 100) } );
				feature.data.popupContentHTML = popupContentHTML;
				feature.data.overflow = "hidden";

				marker = new OpenLayers.Marker(ll);
				marker.feature = feature;

				var markerClick = function(evt) {
					if (this.popup == null) {
						this.popup = this.createPopup(this.closeBox);
					} else {
				marker.events.register("mousedown", feature, markerClick);


			function getTileURL(bounds) {
				var res = this.map.getResolution();
				var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
				var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
				var z = this.map.getZoom();
				var limit = Math.pow(2, z);
				if (y < 0 || y >= limit) {
					return null;
				} else {
					x = ((x % limit) + limit) % limit;
					url = this.url;
					path= z + "/" + x + "/" + y + "." + this.type;
					if (url instanceof Array) {
						url = this.selectUrl(path, url);
					return url+path;

			function drawmap() {

				map = new OpenLayers.Map('map', {
					projection: new OpenLayers.Projection("EPSG:900913"),
					displayProjection: new OpenLayers.Projection("EPSG:4326"),
					eventListeners: {
						"moveend": mapEventMove,
						//"zoomend": mapEventZoom
					controls: [
						new OpenLayers.Control.Navigation(),
						new OpenLayers.Control.ScaleLine({topOutUnits : "nmi", bottomOutUnits: "km", topInUnits: 'nmi', bottomInUnits: 'km', maxWidth: '40'}),
						new OpenLayers.Control.LayerSwitcher(),
						new OpenLayers.Control.MousePosition(),
						new OpenLayers.Control.PanZoomBar()],
						new OpenLayers.Bounds(-20037508.34, -20037508.34, 20037508.34, 20037508.34),
					numZoomLevels: 18,
					maxResolution: 156543,
					units: 'meters'

				// Add Layers to map-------------------------------------------------------------------------------------------------------
				// Mapnik
				layer_mapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik");
				// Seamark
				layer_seamark = new OpenLayers.Layer.TMS("Seezeichen", "http://tiles.openseamap.org/seamark/", { numZoomLevels: 18, type: 'png', getURL: getTileURL, isBaseLayer: false, displayOutsideMaxExtent: true});
				// Harbours
				layer_pois = new OpenLayers.Layer.Vector("Häfen", { projection: new OpenLayers.Projection("EPSG:4326"), visibility: true, displayOutsideMaxExtent:true});
				map.addLayers([layer_mapnik, layer_seamark, layer_pois]);
				jumpTo(lon, lat, zoom);

				// Update harbour layer

			// Map event listener moved
			function mapEventMove(event) {
				// Update harbour layer


<!-- body.onload is called once the page is loaded (call the 'init' function) -->
<body onload="drawmap();">

    <!-- define a DIV into which the map will appear. Make it take up the whole window -->
    <div style="width:100%; height:100%" id="map"></div>




The OpenSeaMap tile server is accessible at this URLs:


The seamark-layer is added with the following lines:

var layer_seamark = new OpenLayers.Layer.TMS ( "seamark", "http://t1.openseamap.org/seamark/", 
{ numZoomLevels: 18, type: 'png', getURL:getTileURL, isBaseLayer:false, displayOutsideMaxExtent:true });


WordPress OSM Plugin

For WordPress there is a plugin based on OpenLayers 6.x to integrate slippy OpenSeaMaps. Some features are:

* add GPX and KML files
* add markers with html text popup
* customize controls (overviewmap, fullscreen, ...)

Find more information here:

WP OSM Plugin Downlaod @ WordPress.org
WP OSM Plugin Page
Sample how to integrate OpenSeaMap in WordPress


In the Drupal-Center-Forum you can find a module based on OpenLayers at MappingKit.


In the TYPO3 Extension Repository you will find 2 extensions: