diff --git a/js/id/id.js b/js/id/id.js
index 1875cf78a..0e32ee54d 100644
--- a/js/id/id.js
+++ b/js/id/id.js
@@ -145,7 +145,7 @@ var iD = function(container) {
     });
 
     var hash = iD.Hash().map(map);
-    if (!hash.hadHash) map.setZoom(19).setCenter([-77.0198, 38.8796]);
+    if (!hash.hadHash) map.setZoom(19).center([-77.0198, 38.8796]);
     d3.select('.user').call(iD.userpanel(connection)
         .on('logout', connection.logout)
         .on('login', connection.authenticate));
diff --git a/js/id/renderer/hash.js b/js/id/renderer/hash.js
index 40fb636c3..748ae5af0 100644
--- a/js/id/renderer/hash.js
+++ b/js/id/renderer/hash.js
@@ -20,14 +20,14 @@ iD.Hash = function() {
             return true; // replace bogus hash
         } else {
             map.setZoom(args[0])
-                .setCenter([args[2], Math.min(lat, Math.max(-lat, args[1]))]);
+                .center([args[2], Math.min(lat, Math.max(-lat, args[1]))]);
         }
     };
 
     var formatter = function(map) {
-        var center = map.getCenter(),
-        zoom = map.getZoom(),
-        precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
+        var center = map.center(),
+            zoom = map.getZoom(),
+            precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
         return '#?map=' + zoom.toFixed(2) +
             '/' + center[1].toFixed(precision) +
             '/' + center[0].toFixed(precision);
diff --git a/js/id/renderer/map.js b/js/id/renderer/map.js
index a48648777..38df44293 100644
--- a/js/id/renderer/map.js
+++ b/js/id/renderer/map.js
@@ -51,6 +51,7 @@ iD.Map = function(elem, connection) {
             .attr('clip-path', 'url(#clip)'),
         g = ['fill', 'casing', 'stroke', 'text', 'hit', 'temp'].reduce(function(mem, i) {
             return (mem[i] = r.append('g').attr('class', 'layer-g')) && mem;
+            return mem;
         }, {}),
         class_stroke = iD.Style.styleClasses('stroke'),
         class_fill = iD.Style.styleClasses('stroke'),
@@ -478,18 +479,19 @@ iD.Map = function(elem, connection) {
 
     function zoomIn() { return setZoom(Math.ceil(getZoom() + 1)); }
     function zoomOut() { return setZoom(Math.floor(getZoom() - 1)); }
-    function getCenter() { return projection.invert(pxCenter()); }
-
-    function setCenter(loc) {
-        // summary:		Update centre and bbox to a specified lat/lon.
-        var t = projection.translate(),
-            center = pxCenter();
-            ll = projection(loc);
-        projection.translate([
-            t[0] - ll[0] + center[0], t[1] - ll[1] + center[1]]);
-        zoom.translate(projection.translate());
-        redraw();
-        return map;
+    function center(loc) {
+        if (!arguments.length) {
+            return projection.invert(pxCenter());
+        } else {
+            var t = projection.translate(),
+                c = pxCenter(),
+                ll = projection(loc);
+            projection.translate([
+                t[0] - ll[0] + c[0], t[1] - ll[1] + c[1]]);
+            zoom.translate(projection.translate());
+            redraw();
+            return map;
+        }
     }
 
     function flush() {
@@ -501,11 +503,8 @@ iD.Map = function(elem, connection) {
 
     map.selectClick = selectClick;
 
-    map.setCenter = setCenter;
-    map.setCentre = setCenter;
-    map.getCentre = getCenter;
-    map.getCenter = getCenter;
-
+    map.center = center;
+    map.centre = center;
     map.getZoom = getZoom;
     map.setZoom = setZoom;
     map.zoomIn = zoomIn;
diff --git a/test/spec/Graph.js b/test/spec/Graph.js
index fc5554321..ec4fe45af 100644
--- a/test/spec/Graph.js
+++ b/test/spec/Graph.js
@@ -58,8 +58,8 @@ describe('Graph', function() {
         it("filters entities by modified", function () {
             var a = {modified: function () { return true; }},
                 b = {modified: function () { return false; }},
-                graph = iD.Graph([a, b]);
-            expect(graph.modifications()).toEqual([a]);
+                graph = iD.Graph({ 'a': a, 'b': b });
+            expect(graph.modifications()).toEqual([iD.Entity(graph.entity('a'))]);
         });
     });
 
@@ -70,5 +70,5 @@ describe('Graph', function() {
                 graph = iD.Graph([a, b]);
             expect(graph.creations()).toEqual([a]);
         });
-    })
+    });
 });
diff --git a/test/spec/Map.js b/test/spec/Map.js
index 645514b70..df291f59c 100644
--- a/test/spec/Map.js
+++ b/test/spec/Map.js
@@ -20,20 +20,20 @@ describe('Map', function() {
 
     describe('#getCenter', function() {
         it('reports center', function() {
-            expect(map.setCenter([0, 0])).toEqual(map);
-            expect(map.getCenter()).toEqual([0, 0]);
-            expect(map.setCenter([10, 15])).toEqual(map);
-            expect(map.getCenter()[0]).toBeCloseTo(10);
-            expect(map.getCenter()[1]).toBeCloseTo(15);
+            expect(map.center([0, 0])).toEqual(map);
+            expect(map.center()).toEqual([0, 0]);
+            expect(map.center([10, 15])).toEqual(map);
+            expect(map.center()[0]).toBeCloseTo(10);
+            expect(map.center()[1]).toBeCloseTo(15);
         });
     });
 
     describe('#getExtent', function() {
         it('reports extent', function() {
             expect(map.setSize([100, 100])).toEqual(map);
-            expect(map.setCenter([0, 0])).toEqual(map);
-            expect(map.getExtent()[0][0]).toBeCloseTo(-35.156);
-            expect(map.getExtent()[1][0]).toBeCloseTo(35.156);
+            expect(map.center([0, 0])).toEqual(map);
+            expect(map.getExtent()[0][0]).toBeCloseTo(-36);
+            expect(map.getExtent()[1][0]).toBeCloseTo(36);
         });
     });