diff --git a/web/gui2/src/main/webapp/app/fw/mast/mast.service.ts b/web/gui2/src/main/webapp/app/fw/mast/mast.service.ts
new file mode 100644
index 0000000..d357458
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/fw/mast/mast.service.ts
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2014-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { Injectable } from '@angular/core';
+import { FnService } from '../util/fn.service';
+import { LogService } from '../../log.service';
+
+const padMobile = 16;
+
+/**
+ * ONOS GUI -- Masthead Service
+ */
+@Injectable()
+export class MastService {
+
+  public mastHeight = 48;
+
+  constructor(
+    private fs: FnService,
+    private log: LogService
+  ) {
+    if (this.fs.isMobile()) {
+        this.mastHeight += padMobile;
+    }
+
+    this.log.debug('MastService constructed');
+  }
+
+}