diff --git a/plugins/cross_link.user.js b/plugins/cross_link.user.js
new file mode 100644
index 00000000..9ad3def8
--- /dev/null
+++ b/plugins/cross_link.user.js
@@ -0,0 +1,285 @@
+// ==UserScript==
+// @id             iitc-plugin-cross-links@mcben
+// @name           IITC plugin: cross links
+// @category       Layer
+// @version        1.0.@@DATETIMEVERSION@@
+// @namespace      https://github.com/jonatkins/ingress-intel-total-conversion
+// @updateURL      @@UPDATEURL@@
+// @downloadURL    @@DOWNLOADURL@@
+// @description    [McBen] requires drawtool! coloring of link collision
+// @include        https://www.ingress.com/intel*
+// @include        http://www.ingress.com/intel*
+// @match          https://www.ingress.com/intel*
+// @match          http://www.ingress.com/intel*
+// @grant          none
+// ==/UserScript==
+
+@@PLUGINSTART@@
+
+// PLUGIN START ////////////////////////////////////////////////////////
+
+
+window.plugin.crossLinks = function() {};
+
+/* Great Circle Arc Intersection
+    Conecpt in short:
+       - build a plane of each arc (p1,p2,center)
+       - find intersection line and intersection points on sphere
+       - check if a point are on both arcs
+    see: http://geospatialmethods.org/spheres/GCAIntersect.html
+*/
+var PI = Math.PI;
+var radians = PI / 180;
+var near_0 = 1e-6;
+
+function greatCircleArcIntersect(a0,a1,b0,b1) {
+
+    // Order points
+    if (a1.lat < a0.lat) { var t=a1;a1=a0;a0=t;}
+    if (b1.lat < b0.lat) { var t=b1;b1=b0;b0=t;}
+
+    var λ0 = a0.lat,
+        λ1 = a1.lat,
+        λ2 = b0.lat,
+        λ3 = b1.lat,
+        δλ0 = λ1 - λ0,
+        δλ1 = λ3 - λ2,
+        sλ0 = δλ0 > 180,
+        sλ1 = δλ1 > 180,
+        φ0 = a0.lng * radians,
+        φ1 = a1.lng * radians,
+        φ2 = b0.lng * radians,
+        φ3 = b1.lng * radians,
+        t;
+
+    // Check if longitude ranges overlap.
+    // TODO handle antimeridian crossings.
+    if (!sλ0 && !sλ1 && (λ0 > λ3 || λ2 > λ1)) return;
+
+    // Check for polar endpoints.
+    if (Math.abs(Math.abs(φ0) - PI / 2) < near_0) λ0 = λ1, δλ0 = 0, sλ0 = false;
+    if (Math.abs(Math.abs(φ1) - PI / 2) < near_0) λ1 = λ0, δλ0 = 0, sλ0 = false;
+    if (Math.abs(Math.abs(φ2) - PI / 2) < near_0) λ2 = λ3, δλ1 = 0, sλ1 = false;
+    if (Math.abs(Math.abs(φ3) - PI / 2) < near_0) λ3 = λ2, δλ1 = 0, sλ1 = false;
+
+    // Check for arcs along meridians.
+    var m0 = δλ0 < near_0 || Math.abs(δλ0 - 180) < near_0,
+        m1 = δλ1 < near_0 || Math.abs(δλ1 - 180) < near_0;
+
+    λ0 *= radians, λ1 *= radians, λ2 *= radians, λ3 *= radians;
+
+    // Intersect two great circles and check the two intersection points against
+    // the longitude ranges.  The intersection points are simply the cross
+    // product of the great-circle normals ±n1⨯n2.
+
+    // First plane.
+    var cosφ,
+        x0 = (cosφ = Math.cos(φ0)) * Math.cos(λ0),
+        y0 = cosφ * Math.sin(λ0),
+        z0 = Math.sin(φ0),
+        x1 = (cosφ = Math.cos(φ1)) * Math.cos(λ1),
+        y1 = cosφ * Math.sin(λ1),
+        z1 = Math.sin(φ1),
+        n0x = y0 * z1 - z0 * y1,
+        n0y = z0 * x1 - x0 * z1,
+        n0z = x0 * y1 - y0 * x1,
+        m = length(n0x, n0y, n0z);
+
+    n0x /= m, n0y /= m, n0z /= m;
+
+    // Second plane.
+    var x2 = (cosφ = Math.cos(φ2)) * Math.cos(λ2),
+        y2 = cosφ * Math.sin(λ2),
+        z2 = Math.sin(φ2),
+        x3 = (cosφ = Math.cos(φ3)) * Math.cos(λ3),
+        y3 = cosφ * Math.sin(λ3),
+        z3 = Math.sin(φ3),
+        n1x = y2 * z3 - z2 * y3,
+        n1y = z2 * x3 - x2 * z3,
+        n1z = x2 * y3 - y2 * x3,
+        m = length(n1x, n1y, n1z);
+
+    n1x /= m, n1y /= m, n1z /= m;
+
+    var Nx = n0y * n1z - n0z * n1y,
+        Ny = n0z * n1x - n0x * n1z,
+        Nz = n0x * n1y - n0y * n1x;
+
+    if (length(Nx, Ny, Nz) < near_0) return;
+
+    var λ = Math.atan2(Ny, Nx);
+    if ( (sλ0 ^ (λ0 <= λ && λ <= λ1) || m0 && Math.abs(λ - λ0) < near_0) && (sλ1 ^ (λ2 <= λ && λ <= λ3) || m1 && Math.abs(λ - λ2) < near_0) || (Nz = -Nz,
+         (sλ0 ^ (λ0 <= (λ = (λ + 2 * PI) % (2 * PI) - PI) && λ <= λ1) || m0 && Math.abs(λ - λ0) < near_0) && (sλ1 ^ (λ2 <= λ && λ <= λ3) || m1 && Math.abs(λ - λ2) < near_0))) {
+
+        var φ = Math.asin(Nz / length(Nx, Ny, Nz));
+
+        if (m0 || m1) {
+          if (m1) φ0 = φ2, φ1 = φ3, λ0 = λ2, λ1 = λ3, δλ0 = δλ1;
+
+          if (δλ0 > near_0)
+            return (φ0 + φ1 > 0 ^ φ < (Math.abs(λ - λ0) < near_0 ? φ0 : φ1)) ? [λ / radians, φ / radians] : null;
+
+          // Ensure φ0 ≤ φ1.
+          if (φ1 < φ0) t = φ0, φ0 = φ1, φ1 = t;
+          return (Math.abs(λ - (m0 ? λ0 : λ2)) < near_0 && φ0 <= φ && φ <= φ1) ? [λ / radians, φ / radians] : null;
+        }
+
+        return [λ / radians, φ / radians];
+    }
+}
+
+function length(x, y, z) {
+  return Math.sqrt(x * x + y * y + z * z);
+}
+
+/*
+ smallCircleIntersect
+ idea:
+  - build the plane of the small circle: normalvector (center) and p=center+radian // E:n1*x+n2*y+n3*z=n1*p1+n2*p2+n3*p3
+  - calc distance to both points // d=(n1*x+n2*y+n3*z- (n1*p1+n2*p2+n3*p3)) / length(n)
+  - both >0 = inside ; one >0 = collision
+*/
+
+window.plugin.crossLinks.testPolyLine = function (polyline, link,closed) {
+
+    var a = link.getLatLngs();
+    var b = polyline.getLatLngs();
+
+    for (var i=0;i<b.length-1;++i) {
+        if (greatCircleArcIntersect(a[0],a[1],b[i],b[i+1])) return true;
+    }
+
+    if (closed) {
+        if (greatCircleArcIntersect(a[0],a[1],b[b.length],b[0])) return true;
+    }
+
+    return false;
+}
+
+window.plugin.crossLinks.onLinkAdded = function (data) {
+  	if (window.plugin.crossLinks.disabled) return;
+
+    plugin.crossLinks.testLink(data.link);
+}
+
+window.plugin.crossLinks.checkAllLinks = function() {
+    if (window.plugin.crossLinks.disabled) return;
+
+  	console.debug("Cross-Links: checking all links");
+	plugin.crossLinks.linkLayer.clearLayers();
+    plugin.crossLinks.linkLayerGuids = {};
+
+  	$.each(window.links, function(guid, link) {
+        plugin.crossLinks.testLink(link);
+    });
+}
+
+window.plugin.crossLinks.testLink = function (link) {
+    if (plugin.crossLinks.linkLayerGuids[link.options.guid]) return;
+
+    for (var i in plugin.drawTools.drawnItems._layers) { // leaflet don't support breaking out of the loop
+       var layer = plugin.drawTools.drawnItems._layers[i];
+       if (layer instanceof L.GeodesicPolygon) {
+           if (plugin.crossLinks.testPolyLine(layer, link,true)) {
+               plugin.crossLinks.showLink(link);
+               break;
+           }
+        } else if (layer instanceof L.GeodesicPolyline) {
+            if (plugin.crossLinks.testPolyLine(layer, link)) {
+                plugin.crossLinks.showLink(link);
+                break;
+            }
+        }
+    };
+}
+
+
+window.plugin.crossLinks.showLink = function(link) {
+
+    var poly = L.geodesicPolyline(link.getLatLngs(), {
+       color: '#f11',
+       opacity: 0.7,
+       weight: 4,
+       clickable: false,
+
+       guid: link.options.guid
+    });
+
+    poly.addTo(plugin.crossLinks.linkLayer);
+    plugin.crossLinks.linkLayerGuids[link.options.guid]=poly;
+}
+
+window.plugin.crossLinks.onMapDataRefreshEnd = function () {
+    window.plugin.crossLinks.linkLayer.bringToFront();
+
+    window.plugin.crossLinks.testForDeletedLinks();
+}
+
+window.plugin.crossLinks.testAllLinksAgainstLayer = function (layer) {
+    if (window.plugin.crossLinks.disabled) return;
+
+  	$.each(window.links, function(guid, link) {
+        if (!plugin.crossLinks.linkLayerGuids[link.options.guid])
+        {
+            if (layer instanceof L.GeodesicPolygon) {
+                if (plugin.crossLinks.testPolyLine(layer, link,true)) {
+                    plugin.crossLinks.showLink(link);
+                }
+            } else if (layer instanceof L.GeodesicPolyline) {
+                if (plugin.crossLinks.testPolyLine(layer, link)) {
+                    plugin.crossLinks.showLink(link);
+                }
+            }
+        }
+    });
+}
+
+window.plugin.crossLinks.testForDeletedLinks = function () {
+    window.plugin.crossLinks.linkLayer.eachLayer( function(layer) {
+        var guid = layer.options.guid;
+        if (!window.mapDataRequest.render.seenLinksGuid[guid]) {
+            console.log("link removed");
+            plugin.crossLinks.linkLayer.removeLayer(layer);
+            delete plugin.crossLinks.linkLayerGuids[guid];
+        }
+    });
+}
+
+window.plugin.crossLinks.createLayer = function() {
+    window.plugin.crossLinks.linkLayer = new L.FeatureGroup();
+    window.plugin.crossLinks.linkLayerGuids={};
+  	window.addLayerGroup('Cross Links', window.plugin.crossLinks.linkLayer, true);
+
+  	map.on('layeradd', function(obj) {
+	    if(obj.layer === window.plugin.crossLinks.linkLayer) {
+    	    delete window.plugin.crossLinks.disabled;
+        	window.plugin.crossLinks.checkAllLinks();
+    	}
+  	});
+  	map.on('layerremove', function(obj) {
+    	if(obj.layer === window.plugin.crossLinks.linkLayer) {
+        	window.plugin.crossLinks.disabled = true;
+    	}
+  	});
+}
+
+var setup = function() {
+    if (window.plugin.drawTools === undefined) {
+       alert("'Cross-Links' requires 'draw-tools'");
+       return;
+    }
+
+    window.plugin.crossLinks.createLayer();
+
+    // events
+    map.on('draw:created', function(e) { window.plugin.crossLinks.testAllLinksAgainstLayer(e.layer);});
+    map.on('draw:deleted', function(e) {window.plugin.crossLinks.checkAllLinks(); });
+    map.on('draw:edited', function(e) {window.plugin.crossLinks.checkAllLinks();});
+
+    window.addHook('linkAdded', window.plugin.crossLinks.onLinkAdded);
+    window.addHook('mapDataRefreshEnd', window.plugin.crossLinks.onMapDataRefreshEnd);
+}
+
+// PLUGIN END //////////////////////////////////////////////////////////
+
+@@PLUGINEND@@