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) {