diff --git a/gnss/2.0/IGnssBatchingCallback.hal b/gnss/2.0/IGnssBatchingCallback.hal
new file mode 100644
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+++ b/gnss/2.0/IGnssBatchingCallback.hal
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+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package android.hardware.gnss@2.0;
+
+/** The callback interface to report measurements from the HAL. */
+interface IGnssBatchingCallback {
+    /**
+     * Called when a batch of locations is output, by various means, including
+     * a flush request, as well as the buffer becoming full (if appropriate option
+     * is set.)
+     *
+     * All locations returned by this callback must be cleared from the hardware
+     * buffer, such the sequential calls of this callback do not return any
+     * redundant locations.  (Same lat/lon, at a new time, is acceptable.)
+     *
+     * The GnssLocation struct in gnss@2.0 is extended to include elapsed realtime
+     * information.
+     *
+     * @param locations GNSS Location information from HAL.
+     */
+    gnssLocationBatchCb(vec<GnssLocation> locations);
+};