diff --git a/debug/data/geoDateBorder.js b/debug/data/geoDateBorder.js
new file mode 100644
index 0000000..099206d
--- /dev/null
+++ b/debug/data/geoDateBorder.js
@@ -0,0 +1,730 @@
+var geoDateBorder =[
+    {
+        "lng":145.529,
+        "lat":18.515
+    },
+    {
+        "lng":130.726,
+        "lat":32.782
+    },
+    {
+        "lng":-153.452,
+        "lat":59.658
+    },
+    {
+        "lng":140.493,
+        "lat":27.831
+    },
+    {
+        "lng":178.76,
+        "lat":51.797
+    },
+    {
+        "lng":144.679,
+        "lat":37.149
+    },
+    {
+        "lng":153.221,
+        "lat":54.892
+    },
+    {
+        "lng":150.788,
+        "lat":46.221
+    },
+    {
+        "lng":143.949,
+        "lat":37.89
+    },
+    {
+        "lng":145.064,
+        "lat":49.8
+    },
+    {
+        "lng":143.264,
+        "lat":38.034
+    },
+    {
+        "lng":-171.836,
+        "lat":52.05
+    },
+    {
+        "lng":141.588,
+        "lat":38.276
+    },
+    {
+        "lng":142.372,
+        "lat":38.297
+    },
+    {
+        "lng":141.111,
+        "lat":36.281
+    },
+    {
+        "lng":144.59,
+        "lat":38.058
+    },
+    {
+        "lng":142.842,
+        "lat":38.435
+    },
+    {
+        "lng":143.698,
+        "lat":26.901
+    },
+    {
+        "lng":155.154,
+        "lat":46.857
+    },
+    {
+        "lng":152.886,
+        "lat":53.882
+    },
+    {
+        "lng":142.668,
+        "lat":22.013
+    },
+    {
+        "lng":154.524,
+        "lat":46.243
+    },
+    {
+        "lng":153.266,
+        "lat":46.592
+    },
+    {
+        "lng":167.089,
+        "lat":60.949
+    },
+    {
+        "lng":144.896,
+        "lat":38.107
+    },
+    {
+        "lng":142.039,
+        "lat":38.276
+    },
+    {
+        "lng":145.119,
+        "lat":43.006
+    },
+    {
+        "lng":136.618,
+        "lat":33.07
+    },
+    {
+        "lng":137.071,
+        "lat":33.184
+    },
+    {
+        "lng":178.65,
+        "lat":51.146
+    },
+    {
+        "lng":142.619,
+        "lat":37.812
+    },
+    {
+        "lng":143.91,
+        "lat":41.815
+    },
+    {
+        "lng":141.568,
+        "lat":38.849
+    },
+    {
+        "lng":-147.444,
+        "lat":63.517
+    },
+    {
+        "lng":143.73,
+        "lat":22.338
+    },
+    {
+        "lng":162.035,
+        "lat":54.841
+    },
+    {
+        "lng":-177.632,
+        "lat":51.564
+    },
+    {
+        "lng":-176.847,
+        "lat":51.478
+    },
+    {
+        "lng":149.3,
+        "lat":44.663
+    },
+    {
+        "lng":130.175,
+        "lat":27.929
+    },
+    {
+        "lng":142.827,
+        "lat":52.629
+    },
+    {
+        "lng":143.419,
+        "lat":40.525
+    },
+    {
+        "lng":147.916,
+        "lat":43.905
+    },
+    {
+        "lng":147.321,
+        "lat":43.773
+    },
+    {
+        "lng":158.647,
+        "lat":51.934
+    },
+    {
+        "lng":139.197,
+        "lat":42.851
+    },
+    {
+        "lng":157.829,
+        "lat":51.218
+    },
+    {
+        "lng":143.691,
+        "lat":43.3
+    },
+    {
+        "lng":143.33,
+        "lat":39.419
+    },
+    {
+        "lng":151.021,
+        "lat":45.533
+    },
+    {
+        "lng":142.76,
+        "lat":39.837
+    },
+    {
+        "lng":-174.776,
+        "lat":51.52
+    },
+    {
+        "lng":163.4,
+        "lat":56.2
+    },
+    {
+        "lng":148.192,
+        "lat":44.117
+    },
+    {
+        "lng":139.102,
+        "lat":40.462
+    },
+    {
+        "lng":146.753,
+        "lat":43.53
+    },
+    {
+        "lng":146.581,
+        "lat":44.592
+    },
+    {
+        "lng":142.028,
+        "lat":38.19
+    },
+    {
+        "lng":148.862,
+        "lat":44.244
+    },
+    {
+        "lng":148.439,
+        "lat":44.932
+    },
+    {
+        "lng":118.401,
+        "lat":39.664
+    },
+    {
+        "lng":117.98,
+        "lat":39.57
+    },
+    {
+        "lng":149.123,
+        "lat":44.915
+    },
+    {
+        "lng":147.734,
+        "lat":43.024
+    },
+    {
+        "lng":122.58,
+        "lat":40.64
+    },
+    {
+        "lng":173.5,
+        "lat":53.11
+    },
+    {
+        "lng":146.4,
+        "lat":43.3
+    },
+    {
+        "lng":145.8,
+        "lat":43.2
+    },
+    {
+        "lng":156.6,
+        "lat":50.5
+    },
+    {
+        "lng":140.7,
+        "lat":33.3
+    },
+    {
+        "lng":140.8,
+        "lat":33.3
+    },
+    {
+        "lng":163.3,
+        "lat":56
+    },
+    {
+        "lng":141.2,
+        "lat":46.5
+    },
+    {
+        "lng":143.5,
+        "lat":41.4
+    },
+    {
+        "lng":-177.2,
+        "lat":51.4
+    },
+    {
+        "lng":131.7,
+        "lat":32.2
+    },
+    {
+        "lng":163.6,
+        "lat":57.7
+    },
+    {
+        "lng":147.9,
+        "lat":43.6
+    },
+    {
+        "lng":119.4,
+        "lat":38.2
+    },
+    {
+        "lng":143.2,
+        "lat":45
+    },
+    {
+        "lng":140.6,
+        "lat":26.3
+    },
+    {
+        "lng":143.1,
+        "lat":39.4
+    },
+    {
+        "lng":143.2,
+        "lat":40.8
+    },
+    {
+        "lng":142.7,
+        "lat":41.5
+    },
+    {
+        "lng":132.5,
+        "lat":32.3
+    },
+    {
+        "lng":146.701,
+        "lat":43.586
+    },
+    {
+        "lng":151.11,
+        "lat":45.53
+    },
+    {
+        "lng":148.7,
+        "lat":44.7
+    },
+    {
+        "lng":177.93,
+        "lat":50.32
+    },
+    {
+        "lng":178.55,
+        "lat":51.29
+    },
+    {
+        "lng":139.2,
+        "lat":38.65
+    },
+    {
+        "lng":-147.648,
+        "lat":61.017
+    },
+    {
+        "lng":150.563,
+        "lat":44.772
+    },
+    {
+        "lng":149.798,
+        "lat":44.77
+    },
+    {
+        "lng":149.272,
+        "lat":44.426
+    },
+    {
+        "lng":142.741,
+        "lat":38.073
+    },
+    {
+        "lng":136.7,
+        "lat":36
+    },
+    {
+        "lng":131.8,
+        "lat":31.6
+    },
+    {
+        "lng":143.4,
+        "lat":39.8
+    },
+    {
+        "lng":151.11,
+        "lat":45.89
+    },
+    {
+        "lng":160.5,
+        "lat":53.9
+    },
+    {
+        "lng":159.5,
+        "lat":52.5
+    },
+    {
+        "lng":148.54,
+        "lat":44.53
+    },
+    {
+        "lng":116.4,
+        "lat":56.2
+    },
+    {
+        "lng":-165.2,
+        "lat":55
+    },
+    {
+        "lng":-175.629,
+        "lat":51.292
+    },
+    {
+        "lng":150.5,
+        "lat":46
+    },
+    {
+        "lng":141.7,
+        "lat":34
+    },
+    {
+        "lng":160.057,
+        "lat":52.755
+    },
+    {
+        "lng":142.5,
+        "lat":41.7
+    },
+    {
+        "lng":143.85,
+        "lat":42.15
+    },
+    {
+        "lng":144,
+        "lat":46
+    },
+    {
+        "lng":136,
+        "lat":36.5
+    },
+    {
+        "lng":-161,
+        "lat":54.5
+    },
+    {
+        "lng":141,
+        "lat":43.8
+    },
+    {
+        "lng":135.6,
+        "lat":33
+    },
+    {
+        "lng":-162.832,
+        "lat":53.492
+    },
+    {
+        "lng":137.2,
+        "lat":34.7
+    },
+    {
+        "lng":137.1,
+        "lat":34
+    },
+    {
+        "lng":156.8,
+        "lat":54.9
+    },
+    {
+        "lng":133.9,
+        "lat":35.3
+    },
+    {
+        "lng":132.1,
+        "lat":32
+    },
+    {
+        "lng":139.5,
+        "lat":44.2
+    },
+    {
+        "lng":178.2,
+        "lat":52
+    },
+    {
+        "lng":139.5,
+        "lat":40.1
+    },
+    {
+        "lng":-158.37,
+        "lat":55.48
+    },
+    {
+        "lng":142.2,
+        "lat":37.5
+    },
+    {
+        "lng":141.7,
+        "lat":37
+    },
+    {
+        "lng":141.7,
+        "lat":37.1
+    },
+    {
+        "lng":141.7,
+        "lat":37.2
+    },
+    {
+        "lng":149.4,
+        "lat":44.5
+    },
+    {
+        "lng":164,
+        "lat":55.2
+    },
+    {
+        "lng":165,
+        "lat":55
+    },
+    {
+        "lng":146.5,
+        "lat":43
+    },
+    {
+        "lng":144.622,
+        "lat":39.224
+    },
+    {
+        "lng":131.5,
+        "lat":32
+    },
+    {
+        "lng":139.2,
+        "lat":36.1
+    },
+    {
+        "lng":142.5,
+        "lat":40.5
+    },
+    {
+        "lng":139,
+        "lat":35
+    },
+    {
+        "lng":171.5,
+        "lat":52.5
+    },
+    {
+        "lng":-170,
+        "lat":51
+    },
+    {
+        "lng":154.8,
+        "lat":49.8
+    },
+    {
+        "lng":160.039,
+        "lat":55.663
+    },
+    {
+        "lng":135.1,
+        "lat":35.6
+    },
+    {
+        "lng":147.416,
+        "lat":44.737
+    },
+    {
+        "lng":140.2,
+        "lat":34.9
+    },
+    {
+        "lng":139.5,
+        "lat":35.1
+    },
+    {
+        "lng":162.5,
+        "lat":56.5
+    },
+    {
+        "lng":162.4,
+        "lat":55
+    },
+    {
+        "lng":161,
+        "lat":54
+    },
+    {
+        "lng":151.8,
+        "lat":47
+    },
+    {
+        "lng":145.5,
+        "lat":40.5
+    },
+    {
+        "lng":151.5,
+        "lat":44.5
+    },
+    {
+        "lng":151.5,
+        "lat":45.5
+    },
+    {
+        "lng":136.5,
+        "lat":45.4
+    },
+    {
+        "lng":131,
+        "lat":42.5
+    },
+    {
+        "lng":-169.12,
+        "lat":54.79
+    },
+    {
+        "lng":163,
+        "lat":56.5
+    },
+    {
+        "lng":160,
+        "lat":46.5
+    },
+    {
+        "lng":141,
+        "lat":33
+    },
+    {
+        "lng":-170,
+        "lat":53.3
+    },
+    {
+        "lng":178.5,
+        "lat":48.5
+    },
+    {
+        "lng":131.5,
+        "lat":29.5
+    },
+    {
+        "lng":142.9,
+        "lat":38.3
+    },
+    {
+        "lng":163.3,
+        "lat":53.5
+    },
+    {
+        "lng":155,
+        "lat":47
+    },
+    {
+        "lng":143,
+        "lat":22
+    },
+    {
+        "lng":139.8,
+        "lat":39.2
+    },
+    {
+        "lng":130.67,
+        "lat":31.58
+    },
+    {
+        "lng":155.5,
+        "lat":47.5
+    },
+    {
+        "lng":152,
+        "lat":46
+    },
+    {
+        "lng":-155,
+        "lat":57.5
+    },
+    {
+        "lng":130,
+        "lat":28
+    },
+    {
+        "lng":156,
+        "lat":51.8
+    },
+    {
+        "lng":145,
+        "lat":42
+    },
+    {
+        "lng":138.5,
+        "lat":33
+    },
+    {
+        "lng":131,
+        "lat":32
+    },
+    {
+        "lng":175,
+        "lat":52
+    },
+    {
+        "lng":141.5,
+        "lat":34.5
+    },
+    {
+        "lng":150,
+        "lat":45
+    },
+    {
+        "lng":-169.73,
+        "lat":52.59
+    },
+    {
+        "lng":147,
+        "lat":51.5
+    }
+];
\ No newline at end of file
diff --git a/debug/geo.html b/debug/geo.html
index d52ca05..c28f480 100644
--- a/debug/geo.html
+++ b/debug/geo.html
@@ -7,6 +7,7 @@
 
     <script src="./data/geo.js"></script>
     <script src="./data/geoNorvay600k.js"></script>
+    <script src="./data/geoDateBorder.js"></script>
 
     <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css" />
     <script src="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.js"></script>
@@ -17,23 +18,31 @@
     <script>
     var map;
     window.onload = function() {
-        var pointset,
+        var mapOpts = {inertia: false},
+            pointset,
+            format,
+            concavity,
             c = document.getElementById('canv'),
             ctx = c.getContext('2d');
 
-        pointset = geoNorvay600k;
-        map = L.map('mapContainer').setView({lat: 67.23806155909902, lng: 23.5546875}, 4);
+        // pointset = geoNorvay600k;
+        // concavity = 0.5;
+        // map = L.map('mapContainer', mapOpts).setView({lat: 67.23806155909902, lng: 23.5546875}, 4);
 
-        // pointset = geo;
-        // map = L.map('mapContainer').setView(pointset[pointset.length-1], 15);
+        pointset = geo;
+        concavity = 0.0011;
+        format = ['.lng', '.lat'];
+        map = L.map('mapContainer', mapOpts).setView(pointset[pointset.length-1], 15);
 
-        L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpandmbXliNDBjZWd2M2x6bDk3c2ZtOTkifQ._QA7i5Mpkd_m30IGElHziw', {
-			maxZoom: 18,
-			attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, ' +
-				'<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
-				'Imagery © <a href="http://mapbox.com">Mapbox</a>',
-			id: 'mapbox.streets'
-		}).addTo(map);
+        // pointset = geoDateBorder;
+        // concavity = 30;
+        // format = ['.lng', '.lat'];
+        // map = L.map('mapContainer', mapOpts).setView(pointset[0], 1);
+
+        L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
+            maxZoom: 18,
+            attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
+        }).addTo(map);
 
         function clearCanvas() {
             ctx.clearRect(0, 0, c.width, c.height);
@@ -43,7 +52,7 @@
                 var pt = map.latLngToContainerPoint(pointset[i]);
                 ctx.fillStyle="red";
                 ctx.beginPath();
-                ctx.arc(pt.x, pt.y, 0.5, 0, 2 * Math.PI);
+                ctx.arc(pt.x, pt.y, 2, 0, 2 * Math.PI);
                 ctx.fill();
                 ctx.closePath();
             }
@@ -55,13 +64,12 @@
         map.on('dragend', drawAllPoints);
         map.on('zoomend', drawAllPoints);
 
-        map.on('click', function(e) {
-           console.log(e);
-        });
+        // map.on('click', function(e) {
+        //    console.log(e);
+        // });
 
         console.time('hull');
-        var hullPts = hull(pointset, 0.5);
-        // var hullPts = hull(pointset, 0.0011, ['.lng', '.lat']);
+        var hullPts = hull(pointset, concavity, format);
         console.timeEnd('hull');
         console.log('hullPts.length: ', hullPts.length);