diff --git a/.gitignore b/.gitignore
index 420d7748..5e402b08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,8 +10,9 @@
 dropin.cache
 _trial_temp*/
 
-# our files
-/shinysdr/deps/
+# Non-git deps
+/shinysdr/deps/require.js
+/shinysdr/deps/text.js
 
 # GRC-generated
 shinysdr/test/manual/channel_filter_testbed.py
diff --git a/.gitmodules b/.gitmodules
index 11557c92..65bbec32 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "shinysdr/deps/measviz"]
 	path = shinysdr/deps/measviz
 	url = https://github.com/kpreid/measviz/
+[submodule "shinysdr/deps/geodesy"]
+	path = shinysdr/deps/geodesy
+	url = https://github.com/chrisveness/geodesy
diff --git a/shinysdr/deps/geodesy b/shinysdr/deps/geodesy
new file mode 160000
index 00000000..2c8900f5
--- /dev/null
+++ b/shinysdr/deps/geodesy
@@ -0,0 +1 @@
+Subproject commit 2c8900f59ef984695629fd03f1950484cd6eb26f
diff --git a/shinysdr/i/network/app.py b/shinysdr/i/network/app.py
index dc34c656..a5cb1299 100644
--- a/shinysdr/i/network/app.py
+++ b/shinysdr/i/network/app.py
@@ -19,6 +19,7 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
+import StringIO
 import os
 
 import six
@@ -48,9 +49,9 @@
 from shinysdr.values import SubscriptionContext
 
 
-def _make_static_resource(pathname):
+def _make_static_resource(pathname, cls=static.File):
     # str() because if we happen to pass unicode as the pathname then directory listings break (discovered with Twisted 16.4.1).
-    r = static.File(str(pathname),
+    r = cls(str(pathname),
         defaultType=b'text/plain',
         ignoredExts=[b'.html'])
     r.contentTypes[b'.csv'] = b'text/csv'
@@ -172,6 +173,66 @@ def announce(self, open_client):
             self.__log.info('Visit {url}', url=url)
 
 
+class ConcatenatedReaders(object):
+    def __init__(self, files):
+        self.__files = files
+        self.__current_file = 0
+    
+    def seek(self, offset):
+        for i, f in enumerate(self.__files):
+            f.seek(0, os.SEEK_END)
+            length = f.tell()
+            if offset > length:
+                offset -= length
+                continue
+            f.seek(offset, os.SEEK_SET)
+            self.__current_file = i
+            return
+    
+    def read(self, n=-1):
+        out = defaultstr("")
+        while n != 0 and self.__current_file < len(self.__files):
+            part = self.__files[self.__current_file].read(n)
+            out += part
+            if n < 0 or len(part) < n:
+                self.__current_file += 1
+                if self.__current_file < len(self.__files):
+                    self.__files[self.__current_file].seek(0, os.SEEK_SET)
+            n -= len(part)
+        return out
+    
+    def close(self):
+        for f in self.__files:
+            f.close()
+
+
+class WrappedStaticFile(static.File):
+    prefix = ""
+    suffix = ""
+
+    def openForReading(self):
+        f = self.open()
+        return ConcatenatedReaders([
+            StringIO.StringIO(defaultstr(self.prefix)),
+            f,
+            StringIO.StringIO(defaultstr(self.suffix)),
+        ])
+
+    def getFileSize(self):
+        return len(self.prefix) + self.getsize() + len(self.suffix)
+
+
+class CommonJSStaticFile(WrappedStaticFile):
+    """
+    Serves a CommonJS-style source file with a RequireJS wrapper.
+    """
+    prefix = """define(function (require, exports, module) {
+"""
+    suffix = """
+});
+"""
+
+
 def _put_root_static(wcommon, container_resource):
     """Place all the simple resources, that are not necessarily sourced from files but at least are unchanging and public."""
     
@@ -184,6 +245,12 @@ def _put_root_static(wcommon, container_resource):
         client.putChild(name, _make_static_resource(os.path.join(deps_path, name)))
     for name in ['measviz.js', 'measviz.css']:
         client.putChild(name, _make_static_resource(os.path.join(deps_path, 'measviz/src', name)))
+    geodesy = SlashedResource()
+    client.putChild('geodesy', geodesy)
+    for name in ['latlon-spherical.js', 'dms.js']:
+        geodesy.putChild(name, _make_static_resource(
+            os.path.join(deps_path, 'geodesy', name),
+            CommonJSStaticFile))
     
     # Link deps into /test/.
     test = container_resource.children['test']
@@ -211,11 +278,11 @@ def _put_plugin_resources(client_resource):
     for resource_def in getPlugins(_IClientResourceDef, shinysdr.plugins):
         # Add the plugin's resource to static serving
         plugin_resources.putChild(resource_def.key, resource_def.resource)
-        plugin_resource_url = '/client/plugins/' + urllib.parse.quote(resource_def.key, safe='') + '/'
+        plugin_resource_url = 'plugins/' + urllib.parse.quote(resource_def.key, safe='') + '/'
         # Tell the client to load the plugins
         # TODO constrain path values to be relative (not on a different origin, to not leak urls)
         if resource_def.load_css_path is not None:
-            load_list_css.append(plugin_resource_url + resource_def.load_cs_path)
+            load_list_css.append('/client/' + plugin_resource_url + resource_def.load_cs_path)
         if resource_def.load_js_path is not None:
             # TODO constrain value to be in the directory
             load_list_js.append(plugin_resource_url + resource_def.load_js_path)
diff --git a/shinysdr/i/webparts/block.template.xhtml b/shinysdr/i/webparts/block.template.xhtml
index 5f62a301..0e9bad66 100644
--- a/shinysdr/i/webparts/block.template.xhtml
+++ b/shinysdr/i/webparts/block.template.xhtml
@@ -47,6 +47,7 @@
   'use strict';
   requirejs.config({
     baseUrl: "/client",
+    nodeIdCompat: true,
   });
   requirejs(['main'], function (main) {
     main({
diff --git a/shinysdr/i/webparts/index.template.xhtml b/shinysdr/i/webparts/index.template.xhtml
index c0616ab0..23437b71 100644
--- a/shinysdr/i/webparts/index.template.xhtml
+++ b/shinysdr/i/webparts/index.template.xhtml
@@ -100,6 +100,7 @@
   'use strict';
   requirejs.config({
     baseUrl: "/client",
+    nodeIdCompat: true,
   });
   requirejs(['main'], function (main) {
     main({
diff --git a/shinysdr/i/webstatic/client/coordination.js b/shinysdr/i/webstatic/client/coordination.js
index 88ffb83e..005fea95 100644
--- a/shinysdr/i/webstatic/client/coordination.js
+++ b/shinysdr/i/webstatic/client/coordination.js
@@ -19,10 +19,12 @@
   
 define([
   'require',
+  'geodesy/latlon-spherical',
   './types',
   './values',
 ], (
   require,
+  LatLon,
   import_types,
   import_values
 ) => {
@@ -36,6 +38,7 @@ define([
     ConstantCell,
     LocalCell,
     StorageCell,
+    findImplementersInBlockCell,
     makeBlock,
   } = import_values;
   
@@ -115,7 +118,32 @@ define([
       // (This will require knowledge of retuning which is currently done implicitly on the server side.)
       
       if (record) {
+        // TODO: The server really needs to track the selected record because both the source and the record can move, and something needs to constantly recalculate the bearing and drive the rotator.
+        // TODO: Provide a way for the user to disable this (e.g. in EME).
         selectedRecord.set(record);
+        if (record.location) {
+          const componentsCell = radio.source.get().components;
+          const positionedDevices = findImplementersInBlockCell(
+            undefined,
+            componentsCell,
+            'shinysdr.devices.IPositionedDevice').get();
+          const rotators = findImplementersInBlockCell(
+            undefined,
+            componentsCell,
+            'shinysdr.plugins.hamlib.IRotator').get();
+          if (positionedDevices.length && rotators.length) {
+            const track = positionedDevices[0].track.get();
+            const start = new LatLon(track.latitude.value, track.longitude.value);
+            let bearing = start.bearingTo(new LatLon(record.location[0], record.location[1]));
+            rotators.forEach(rotator => {
+              // TODO: It doesn't seem like I should have to do this here; the azimuth cell should know how to unwrap bearings.
+              if (bearing > rotator.Azimuth.type.getMax()) {
+                bearing -= 360;
+              }
+              rotator.Azimuth.set(bearing);
+            });
+          }
+        }
       }
       
       return receiver;
@@ -172,4 +200,4 @@ define([
   exports.ClientStateObject = ClientStateObject;
   
   return Object.freeze(exports);
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/client/map/map-core.js b/shinysdr/i/webstatic/client/map/map-core.js
index c3c78737..5cd6c342 100644
--- a/shinysdr/i/webstatic/client/map/map-core.js
+++ b/shinysdr/i/webstatic/client/map/map-core.js
@@ -19,6 +19,7 @@
 
 define([
   'require',
+  'geodesy/latlon-spherical',
   '../domtools',
   '../events',
   '../gltools',
@@ -34,6 +35,7 @@ define([
   'text!./curves-f.glsl',
 ], (
   require,
+  LatLon,
   import_domtools,
   import_events,
   import_gltools,
@@ -91,7 +93,6 @@ define([
   const {
     cos,
     sin,
-    asin,
     atan2
   } = Math;
   
@@ -100,10 +101,10 @@ define([
   // Degree trig functions.
   // We use degrees in this module because degrees are standard for latitude and longitude, and are also useful for more exact calculations because 360 is exactly representable as a floating-point number whereas 2π is not.
   // TODO: Look at the edge cases and see if it would be useful to have dcos & dsin do modulo 360, so we get that exactness for them.
-  var RADIANS_PER_DEGREE = Math.PI / 180;
+  const RADIANS_PER_DEGREE = Math.PI / 180;
+  const DEGREES_PER_RADIAN = 180 / Math.PI;
   function dcos(x) { return cos(RADIANS_PER_DEGREE * x); }
   function dsin(x) { return sin(RADIANS_PER_DEGREE * x); }
-  function dasin(x) { return asin(x)/RADIANS_PER_DEGREE; }
   function datan2(x, y) { return atan2(x, y)/RADIANS_PER_DEGREE; }
   
   function mean(array) {
@@ -1692,17 +1693,10 @@ define([
   const smoothStep = 1;
   function greatCircleLineAlong(lat, lon, bearing) {
     const line = [];
-    const sinlat = dsin(lat), coslat = dcos(lat);
-    const sinazimuth = dsin(bearing), cosazimuth = dcos(bearing);
+    const start = new LatLon(lat, lon);
     for (let angle = 0; angle < 180 + smoothStep/2; angle += smoothStep) {
-      // Algorithm adapted from https://github.com/chrisveness/geodesy/blob/v1.1.2/latlon-spherical.js#L212
-      const targetLat = dasin(
-        sinlat*dcos(angle) +
-          coslat*dsin(angle)*cosazimuth);
-      const targetLon = lon + datan2(
-        sinazimuth*dsin(angle)*coslat,
-        dcos(angle)-sinlat*dsin(targetLat));
-      line.push(Object.freeze({position: Object.freeze([targetLat, targetLon])}));
+      const point = start.destinationPoint(angle, bearing, DEGREES_PER_RADIAN);
+      line.push(Object.freeze({position: Object.freeze([point.lat, point.lon])}));
     }
     return Object.freeze(line);
   }
diff --git a/shinysdr/i/webstatic/test/index.html b/shinysdr/i/webstatic/test/index.html
index 3d78641b..1a428d67 100644
--- a/shinysdr/i/webstatic/test/index.html
+++ b/shinysdr/i/webstatic/test/index.html
@@ -28,16 +28,20 @@
 </head><body>
   <script>
     require.config({
-      baseUrl: '/client/'
+      baseUrl: '/client/',
+      paths: {
+        'test': '/test',
+      },
+      nodeIdCompat: true,
     });
-    
-    requirejs(['network', '/test/jasmine-glue.js',], (network, {ji, start}) => {
+
+    requirejs(['network', 'test/jasmine-glue',], (network, {ji, start}) => {
       network.externalGet('t/', 'document').then(indexDoc => {
         const testUrls = [];
         Array.prototype.forEach.call(indexDoc.querySelectorAll('a[href]'), anchor => {
-          var url = anchor.href;
-          if (/\/test_.*\.js$/.test(url)) {
-            testUrls.push(url);
+          var url = anchor.getAttribute('href');
+          if (/^test_.*\.js$/.test(url)) {
+            testUrls.push('test/t/' + url);
           }
         });
         requirejs(testUrls, (...results) => {
@@ -55,4 +59,4 @@
       });
     });
   </script>
-</body></html>
\ No newline at end of file
+</body></html>
diff --git a/shinysdr/i/webstatic/test/t/test_audio.js b/shinysdr/i/webstatic/test/t/test_audio.js
index c2a2e233..ebcd89cc 100644
--- a/shinysdr/i/webstatic/test/t/test_audio.js
+++ b/shinysdr/i/webstatic/test/t/test_audio.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'audio/analyser',
   'audio/bufferer',
   'audio/client-source',
@@ -256,4 +256,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_coordination.js b/shinysdr/i/webstatic/test/t/test_coordination.js
index 4955b0db..16c54eea 100644
--- a/shinysdr/i/webstatic/test/t/test_coordination.js
+++ b/shinysdr/i/webstatic/test/t/test_coordination.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'coordination',
   'database',
   'values'
@@ -71,4 +71,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_database.js b/shinysdr/i/webstatic/test/t/test_database.js
index 742d39da..da90311a 100644
--- a/shinysdr/i/webstatic/test/t/test_database.js
+++ b/shinysdr/i/webstatic/test/t/test_database.js
@@ -18,8 +18,8 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
-  '/test/testutil.js',
+  'test/jasmine-glue',
+  'test/testutil',
   'database',
   'events',
 ], (
diff --git a/shinysdr/i/webstatic/test/t/test_domtools.js b/shinysdr/i/webstatic/test/t/test_domtools.js
index 8fc36b61..bb9b380a 100644
--- a/shinysdr/i/webstatic/test/t/test_domtools.js
+++ b/shinysdr/i/webstatic/test/t/test_domtools.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'domtools',
 ], (
   import_jasmine,
@@ -158,4 +158,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_events.js b/shinysdr/i/webstatic/test/t/test_events.js
index 4c79b7e2..bf59c1ac 100644
--- a/shinysdr/i/webstatic/test/t/test_events.js
+++ b/shinysdr/i/webstatic/test/t/test_events.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'events',
 ], (
   import_jasmine,
@@ -218,4 +218,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_map.js b/shinysdr/i/webstatic/test/t/test_map.js
index 9363d128..4921cb99 100644
--- a/shinysdr/i/webstatic/test/t/test_map.js
+++ b/shinysdr/i/webstatic/test/t/test_map.js
@@ -18,8 +18,8 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
-  '/test/testutil.js',
+  'test/jasmine-glue',
+  'test/testutil',
   'map/map-core',
   'types',
   'values',
@@ -149,4 +149,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_pane-manager.js b/shinysdr/i/webstatic/test/t/test_pane-manager.js
index c740f5da..3c38aac0 100644
--- a/shinysdr/i/webstatic/test/t/test_pane-manager.js
+++ b/shinysdr/i/webstatic/test/t/test_pane-manager.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'domtools',
   'events',
   'pane-manager',
diff --git a/shinysdr/i/webstatic/test/t/test_types.js b/shinysdr/i/webstatic/test/t/test_types.js
index 251c40a4..0b382324 100644
--- a/shinysdr/i/webstatic/test/t/test_types.js
+++ b/shinysdr/i/webstatic/test/t/test_types.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'types',
 ], (
   import_jasmine,
@@ -137,4 +137,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_values.js b/shinysdr/i/webstatic/test/t/test_values.js
index d5188a62..f56c70be 100644
--- a/shinysdr/i/webstatic/test/t/test_values.js
+++ b/shinysdr/i/webstatic/test/t/test_values.js
@@ -18,8 +18,8 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
-  '/test/testutil.js',
+  'test/jasmine-glue',
+  'test/testutil',
   'events',
   'types',
   'values',
diff --git a/shinysdr/i/webstatic/test/t/test_widget.js b/shinysdr/i/webstatic/test/t/test_widget.js
index d7b469a2..46e3d106 100644
--- a/shinysdr/i/webstatic/test/t/test_widget.js
+++ b/shinysdr/i/webstatic/test/t/test_widget.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'events',
   'types',
   'values',
@@ -164,4 +164,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/t/test_widgets.js b/shinysdr/i/webstatic/test/t/test_widgets.js
index 209f9d0c..a4b0281f 100644
--- a/shinysdr/i/webstatic/test/t/test_widgets.js
+++ b/shinysdr/i/webstatic/test/t/test_widgets.js
@@ -18,8 +18,8 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
-  '/test/testutil.js', 
+  'test/jasmine-glue',
+  'test/testutil', 
   'types', 
   'values', 
   'widgets',
@@ -253,4 +253,4 @@ define([
   });
   
   return 'ok';
-});
\ No newline at end of file
+});
diff --git a/shinysdr/i/webstatic/test/testutil.js b/shinysdr/i/webstatic/test/testutil.js
index 3d73ec72..c22e0238 100644
--- a/shinysdr/i/webstatic/test/testutil.js
+++ b/shinysdr/i/webstatic/test/testutil.js
@@ -18,7 +18,7 @@
 'use strict';
 
 define([
-  '/test/jasmine-glue.js',
+  'test/jasmine-glue',
   'coordination',
   'database',
   'events',
@@ -199,4 +199,4 @@ define([
   exports.WidgetTester = WidgetTester;
   
   return Object.freeze(exports);
-});
\ No newline at end of file
+});