diff --git a/gnss/2.1/default/Android.bp b/gnss/2.1/default/Android.bp
index 7ef9990..834847e 100644
--- a/gnss/2.1/default/Android.bp
+++ b/gnss/2.1/default/Android.bp
@@ -22,6 +22,7 @@
     vintf_fragments: ["android.hardware.gnss@2.1-service.xml"],
     srcs: [
         "Gnss.cpp",
+        "GnssDebug.cpp",
         "GnssMeasurement.cpp",
         "GnssMeasurementCorrections.cpp",
         "GnssConfiguration.cpp",
diff --git a/gnss/2.1/default/Gnss.cpp b/gnss/2.1/default/Gnss.cpp
index 6b61a82..7db8689 100644
--- a/gnss/2.1/default/Gnss.cpp
+++ b/gnss/2.1/default/Gnss.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "Gnss"
 
 #include "Gnss.h"
+#include "GnssDebug.h"
 #include "GnssMeasurement.h"
 #include "GnssMeasurementCorrections.h"
 #include "Utils.h"
@@ -35,6 +36,8 @@
 
 sp<V2_1::IGnssCallback> Gnss::sGnssCallback_2_1 = nullptr;
 sp<V2_0::IGnssCallback> Gnss::sGnssCallback_2_0 = nullptr;
+sp<V1_1::IGnssCallback> Gnss::sGnssCallback_1_1 = nullptr;
+sp<V1_0::IGnssCallback> Gnss::sGnssCallback_1_0 = nullptr;
 
 Gnss::Gnss() : mMinIntervalMs(1000), mGnssConfiguration{new GnssConfiguration()} {}
 
@@ -55,8 +58,13 @@
             auto svStatus = filterBlacklistedSatellitesV2_1(Utils::getMockSvInfoListV2_1());
             this->reportSvStatus(svStatus);
 
-            const auto location = Utils::getMockLocationV2_0();
-            this->reportLocation(location);
+            if (sGnssCallback_2_1 != nullptr || sGnssCallback_2_0 != nullptr) {
+                const auto location = Utils::getMockLocationV2_0();
+                this->reportLocation(location);
+            } else {
+                const auto location = Utils::getMockLocationV1_0();
+                this->reportLocation(location);
+            }
 
             std::this_thread::sleep_for(std::chrono::milliseconds(mMinIntervalMs));
         }
@@ -84,9 +92,29 @@
 }
 
 // Methods from V1_0::IGnss follow.
-Return<bool> Gnss::setCallback(const sp<V1_0::IGnssCallback>&) {
-    // TODO implement
-    return bool{};
+Return<bool> Gnss::setCallback(const sp<V1_0::IGnssCallback>& callback) {
+    if (callback == nullptr) {
+        ALOGE("%s: Null callback ignored", __func__);
+        return false;
+    }
+
+    sGnssCallback_1_0 = callback;
+
+    uint32_t capabilities = 0x0 | V1_0::IGnssCallback::Capabilities::MEASUREMENTS |
+                            V1_0::IGnssCallback::Capabilities::SCHEDULING;
+    auto ret = sGnssCallback_1_0->gnssSetCapabilitesCb(capabilities);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    IGnssCallback::GnssSystemInfo gnssInfo = {.yearOfHw = 2018};
+
+    ret = sGnssCallback_1_0->gnssSetSystemInfoCb(gnssInfo);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    return true;
 }
 
 Return<void> Gnss::cleanup() {
@@ -96,13 +124,11 @@
 }
 
 Return<bool> Gnss::injectTime(int64_t, int64_t, int32_t) {
-    // TODO implement
-    return bool{};
+    return true;
 }
 
 Return<bool> Gnss::injectLocation(double, double, float) {
-    // TODO implement
-    return bool{};
+    return true;
 }
 
 Return<void> Gnss::deleteAidingData(V1_0::IGnss::GnssAidingData) {
@@ -111,10 +137,10 @@
 }
 
 Return<bool> Gnss::setPositionMode(V1_0::IGnss::GnssPositionMode,
-                                   V1_0::IGnss::GnssPositionRecurrence, uint32_t, uint32_t,
-                                   uint32_t) {
-    // TODO implement
-    return bool{};
+                                   V1_0::IGnss::GnssPositionRecurrence, uint32_t minIntervalMs,
+                                   uint32_t, uint32_t) {
+    mMinIntervalMs = minIntervalMs;
+    return true;
 }
 
 Return<sp<V1_0::IAGnssRil>> Gnss::getExtensionAGnssRil() {
@@ -138,8 +164,8 @@
 }
 
 Return<sp<V1_0::IGnssMeasurement>> Gnss::getExtensionGnssMeasurement() {
-    // TODO implement
-    return ::android::sp<V1_0::IGnssMeasurement>{};
+    ALOGD("Gnss::getExtensionGnssMeasurement");
+    return new GnssMeasurement();
 }
 
 Return<sp<V1_0::IGnssNavigationMessage>> Gnss::getExtensionGnssNavigationMessage() {
@@ -158,8 +184,7 @@
 }
 
 Return<sp<V1_0::IGnssDebug>> Gnss::getExtensionGnssDebug() {
-    // TODO implement
-    return ::android::sp<V1_0::IGnssDebug>{};
+    return new V1_1::implementation::GnssDebug();
 }
 
 Return<sp<V1_0::IGnssBatching>> Gnss::getExtensionGnssBatching() {
@@ -168,9 +193,34 @@
 }
 
 // Methods from V1_1::IGnss follow.
-Return<bool> Gnss::setCallback_1_1(const sp<V1_1::IGnssCallback>&) {
-    // TODO implement
-    return bool{};
+Return<bool> Gnss::setCallback_1_1(const sp<V1_1::IGnssCallback>& callback) {
+    if (callback == nullptr) {
+        ALOGE("%s: Null callback ignored", __func__);
+        return false;
+    }
+
+    sGnssCallback_1_1 = callback;
+
+    uint32_t capabilities = 0x0;
+    auto ret = sGnssCallback_1_1->gnssSetCapabilitesCb(capabilities);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    IGnssCallback::GnssSystemInfo gnssInfo = {.yearOfHw = 2018};
+
+    ret = sGnssCallback_1_1->gnssSetSystemInfoCb(gnssInfo);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    auto gnssName = "Google Mock GNSS Implementation v2.1";
+    ret = sGnssCallback_1_1->gnssNameCb(gnssName);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    return true;
 }
 
 Return<bool> Gnss::setPositionMode_1_1(V1_0::IGnss::GnssPositionMode,
@@ -191,8 +241,7 @@
 }
 
 Return<bool> Gnss::injectBestLocation(const V1_0::GnssLocation&) {
-    // TODO implement
-    return bool{};
+    return true;
 }
 
 // Methods from V2_0::IGnss follow.
@@ -332,6 +381,25 @@
     }
 }
 
+void Gnss::reportLocation(const V1_0::GnssLocation& location) const {
+    std::unique_lock<std::mutex> lock(mMutex);
+    if (sGnssCallback_1_1 != nullptr) {
+        auto ret = sGnssCallback_1_1->gnssLocationCb(location);
+        if (!ret.isOk()) {
+            ALOGE("%s: Unable to invoke callback v1.1", __func__);
+        }
+        return;
+    }
+    if (sGnssCallback_1_0 == nullptr) {
+        ALOGE("%s: No non-null callback", __func__);
+        return;
+    }
+    auto ret = sGnssCallback_1_0->gnssLocationCb(location);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback v1.0", __func__);
+    }
+}
+
 void Gnss::reportLocation(const V2_0::GnssLocation& location) const {
     std::unique_lock<std::mutex> lock(mMutex);
     if (sGnssCallback_2_1 != nullptr) {
diff --git a/gnss/2.1/default/Gnss.h b/gnss/2.1/default/Gnss.h
index 7917bbd..7a2a2c9 100644
--- a/gnss/2.1/default/Gnss.h
+++ b/gnss/2.1/default/Gnss.h
@@ -92,10 +92,13 @@
 
   private:
     void reportLocation(const V2_0::GnssLocation&) const;
+    void reportLocation(const V1_0::GnssLocation&) const;
     void reportSvStatus(const hidl_vec<GnssSvInfo>&) const;
 
     static sp<V2_1::IGnssCallback> sGnssCallback_2_1;
     static sp<V2_0::IGnssCallback> sGnssCallback_2_0;
+    static sp<V1_1::IGnssCallback> sGnssCallback_1_1;
+    static sp<V1_0::IGnssCallback> sGnssCallback_1_0;
     std::atomic<long> mMinIntervalMs;
     sp<GnssConfiguration> mGnssConfiguration;
     std::atomic<bool> mIsActive;
diff --git a/gnss/2.1/default/GnssDebug.cpp b/gnss/2.1/default/GnssDebug.cpp
new file mode 100644
index 0000000..a9f7ded
--- /dev/null
+++ b/gnss/2.1/default/GnssDebug.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#define LOG_TAG "GnssDebug"
+
+#include <log/log.h>
+
+#include "Constants.h"
+#include "GnssDebug.h"
+
+using namespace ::android::hardware::gnss::common;
+
+namespace android {
+namespace hardware {
+namespace gnss {
+namespace V1_1 {
+namespace implementation {
+
+// Methods from ::android::hardware::gnss::V1_0::IGnssDebug follow.
+Return<void> GnssDebug::getDebugData(V1_0::IGnssDebug::getDebugData_cb _hidl_cb) {
+    PositionDebug positionDebug = {
+            .valid = true,
+            .latitudeDegrees = kMockLatitudeDegrees,
+            .longitudeDegrees = kMockLongitudeDegrees,
+            .altitudeMeters = kMockAltitudeMeters,
+            .speedMetersPerSec = kMockSpeedMetersPerSec,
+            .bearingDegrees = kMockBearingDegrees,
+            .horizontalAccuracyMeters = kMockHorizontalAccuracyMeters,
+            .verticalAccuracyMeters = kMockVerticalAccuracyMeters,
+            .speedAccuracyMetersPerSecond = kMockSpeedAccuracyMetersPerSecond,
+            .bearingAccuracyDegrees = kMockBearingAccuracyDegrees,
+            .ageSeconds = 0.99};
+
+    TimeDebug timeDebug = {.timeEstimate = kMockTimestamp,
+                           .timeUncertaintyNs = 1000,
+                           .frequencyUncertaintyNsPerSec = 5.0e4};
+
+    DebugData data = {.position = positionDebug, .time = timeDebug};
+
+    _hidl_cb(data);
+
+    return Void();
+}
+
+}  // namespace implementation
+}  // namespace V1_1
+}  // namespace gnss
+}  // namespace hardware
+}  // namespace android
diff --git a/gnss/2.1/default/GnssDebug.h b/gnss/2.1/default/GnssDebug.h
new file mode 100644
index 0000000..969d337
--- /dev/null
+++ b/gnss/2.1/default/GnssDebug.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef android_hardware_gnss_V1_1_GnssDebug_H_
+#define android_hardware_gnss_V1_1_GnssDebug_H_
+
+#include <android/hardware/gnss/1.0/IGnssDebug.h>
+#include <hidl/Status.h>
+
+namespace android {
+namespace hardware {
+namespace gnss {
+namespace V1_1 {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using V1_0::IGnssDebug;
+
+/* Interface for GNSS Debug support. */
+struct GnssDebug : public IGnssDebug {
+    /*
+     * Methods from ::android::hardware::gnss::V1_0::IGnssDebug follow.
+     * These declarations were generated from IGnssDebug.hal.
+     */
+    Return<void> getDebugData(V1_0::IGnssDebug::getDebugData_cb _hidl_cb) override;
+};
+
+}  // namespace implementation
+}  // namespace V1_1
+}  // namespace gnss
+}  // namespace hardware
+}  // namespace android
+
+#endif  // android_hardware_gnss_V1_1_GnssDebug_H_