diff --git a/src/db/gpx.test.ts b/src/db/gpx.test.ts
new file mode 100644
index 0000000..e6ce094
--- /dev/null
+++ b/src/db/gpx.test.ts
@@ -0,0 +1,59 @@
+import { putNewGpx } from './gpx';
+declare global {
+  var db: any;
+  var dbReady: boolean;
+}
+
+const originalDb = globalThis.db;
+const originalDateNow = globalThis.Date.now;
+
+beforeEach(() => {
+  globalThis.db = { put: jest.fn() };
+  globalThis.Date.now = () => 0;
+});
+
+afterEach(() => {
+  globalThis.db = originalDb;
+  globalThis.Date.now = originalDateNow;
+});
+
+describe('The gpx module', () => {
+  test('db.put() a new Gpx when required', () => {
+    putNewGpx('whatever');
+    expect(globalThis.db.put).toBeCalledWith({
+      _id: 'gpx/whatever',
+      doc: {
+        $: {
+          creator: 'dyomedea version 0.000002',
+          version: '1.1',
+          xmlns: 'http://www.topografix.com/GPX/1/1',
+          'xmlns:dyo': 'http://xmlns.dyomedea.com/',
+          'xmlns:gpxtpx':
+            'http://www.garmin.com/xmlschemas/TrackPointExtension/v1',
+          'xmlns:gpxx': 'http://www.garmin.com/xmlschemas/GpxExtensions/v3',
+          'xmlns:wptx1':
+            'http://www.garmin.com/xmlschemas/WaypointExtension/v1',
+          'xmlns:xsi': 'http://www.w3.org/2001/XMLSchema-instance',
+          'xsi:schemaLocation':
+            'http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www8.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/WaypointExtension/v1 http://www8.garmin.com/xmlschemas/WaypointExtensionv1.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd',
+        },
+        extensions: undefined,
+        metadata: {
+          author: undefined,
+          bounds: undefined,
+          copyright: undefined,
+          desc: undefined,
+          extensions: undefined,
+          keywords: undefined,
+          link: undefined,
+          name: undefined,
+          time: '1970-01-01T00:00:00.000Z',
+        },
+        rte: undefined,
+        trk: undefined,
+        wpt: undefined,
+      },
+      type: 'gpx',
+    });
+  });
+});
diff --git a/src/db/gpx.ts b/src/db/gpx.ts
new file mode 100644
index 0000000..ffd2957
--- /dev/null
+++ b/src/db/gpx.ts
@@ -0,0 +1,44 @@
+import { cloneDeep } from 'lodash';
+import getUri from '../lib/ids';
+
+declare global {
+  var db: any;
+  var dbReady: boolean;
+}
+
+const emptyGpx: Gpx = {
+  $: {
+    version: '1.1',
+    creator: 'dyomedea version 0.000002',
+    xmlns: 'http://www.topografix.com/GPX/1/1',
+    'xmlns:xsi': 'http://www.w3.org/2001/XMLSchema-instance',
+    'xsi:schemaLocation':
+      'http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www8.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/WaypointExtension/v1 http://www8.garmin.com/xmlschemas/WaypointExtensionv1.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd',
+    'xmlns:gpxx': 'http://www.garmin.com/xmlschemas/GpxExtensions/v3',
+    'xmlns:wptx1': 'http://www.garmin.com/xmlschemas/WaypointExtension/v1',
+    'xmlns:gpxtpx': 'http://www.garmin.com/xmlschemas/TrackPointExtension/v1',
+    'xmlns:dyo': 'http://xmlns.dyomedea.com/',
+  },
+  metadata: {
+    name: undefined,
+    desc: undefined,
+    author: undefined,
+    copyright: undefined,
+    link: undefined,
+    time: undefined,
+    keywords: undefined,
+    bounds: undefined,
+    extensions: undefined,
+  },
+  wpt: undefined,
+  rte: undefined,
+  trk: undefined,
+  extensions: undefined,
+};
+
+export const putNewGpx = (id: string) => {
+  const uri = getUri('gpx', { gpx: id });
+  const gpx = cloneDeep(emptyGpx);
+  gpx.metadata!.time = new Date(Date.now()).toISOString();
+  db.put({ _id: uri, type: 'gpx', doc: gpx });
+};
diff --git a/src/db/types.d.ts b/src/db/types.d.ts
new file mode 100644
index 0000000..78d22cf
--- /dev/null
+++ b/src/db/types.d.ts
@@ -0,0 +1,34 @@
+interface Gpx {
+  $: Gpx_;
+  metadata?: Metadata;
+  wpt?: any[];
+  rte?: any[];
+  trk?: any[];
+  extensions?: Extensions;
+}
+
+interface Gpx_ {
+  version: '1.1';
+  creator: string;
+  xmlns: 'http://www.topografix.com/GPX/1/1';
+  'xmlns:xsi'?: 'http://www.w3.org/2001/XMLSchema-instance';
+  'xsi:schemaLocation'?: string;
+  'xmlns:gpxx'?: string;
+  'xmlns:wptx1'?: string;
+  'xmlns:gpxtpx'?: string;
+  'xmlns:dyo'?: 'http://xmlns.dyomedea.com/';
+}
+
+interface Metadata {
+  name?: string;
+  desc?: string;
+  author?: string;
+  copyright?: string;
+  link?: string;
+  time?: string;
+  keywords?: string;
+  bounds?: string;
+  extensions?: Extensions;
+}
+
+interface Extensions {}
diff --git a/src/workers/dispatcher-worker.test.js b/src/workers/dispatcher-worker.test.js
index 416fb9a..7db3e71 100644
--- a/src/workers/dispatcher-worker.test.js
+++ b/src/workers/dispatcher-worker.test.js
@@ -16,8 +16,8 @@ describe('The dispatcher-worker ', () => {
     expect(port.onmessage).toBeDefined();
     expect(port.postMessage).not.toBeCalled();
   });
-  test('receives a ping and sends back an unknownAction', () => {
-    port.onmessage({ data: { id: 5, payload: { action: 'ping' } } });
+  test('receives a ping and sends back an unknownAction', async () => {
+    await port.onmessage({ data: { id: 5, payload: { action: 'ping' } } });
     expect(port.postMessage).toBeCalledWith({
       id: 5,
       payload: 'unknownAction',