diff --git a/src/Core.cpp b/src/Core.cpp
index f67898f..a5fed38 100644
--- a/src/Core.cpp
+++ b/src/Core.cpp
@@ -61,7 +61,7 @@ namespace core {
 	}
 
 	uint8_t notifyFailures(PositionEntryMetadata &metadata) {
-		SIM808RegistrationStatus networkStatus;
+		SIM808_NETWORK_REGISTRATION_STATE networkStatus;
 		char buffer[SMS_BUFFER_SIZE];
 		const __FlashStringHelper * backupFailureString = F(" Backup battery failure ?");
 		bool notified = false;
@@ -74,7 +74,7 @@ namespace core {
 		network::powerOn();
 		networkStatus = network::waitForRegistered(NETWORK_DEFAULT_TOTAL_TIMEOUT_MS);
 
-		if (network::isAvailable(networkStatus.stat)) {
+		if (network::isAvailable(networkStatus)) {
 			strncpy_P(buffer, PSTR("Alerts !"), SMS_BUFFER_SIZE);
 			if (bitRead(triggered, ALERT_BATTERY_LEVEL_1) || bitRead(triggered, ALERT_BATTERY_LEVEL_2)) {
 				details::appendToSmsBuffer(buffer, PSTR("\n- Battery at %d%%."), metadata.batteryLevel);
diff --git a/src/Gps.cpp b/src/Gps.cpp
index 3529cf1..013fe33 100644
--- a/src/Gps.cpp
+++ b/src/Gps.cpp
@@ -35,7 +35,7 @@ namespace gps {
 		SIM808_GPS_STATUS currentStatus = SIM808_GPS_STATUS::OFF;
 
 		do {
-			currentStatus = hardware::sim808::device.getGpsStatus(lastPosition);
+			currentStatus = hardware::sim808::device.getGpsStatus(lastPosition, GPS_POSITION_SIZE);
 			if (currentStatus > SIM808_GPS_STATUS::FIX) break; //if we have an accurate fix, break right now
 
 			NOTICE_FORMAT("acquireCurrentPosition", "%d", currentStatus);
@@ -90,7 +90,7 @@ namespace gps {
 	}
 
 	uint8_t getVelocity() {
-		uint8_t velocity;
+		int16_t velocity;
 		if (!hardware::sim808::device.getGpsField(lastPosition, SIM808_GPS_FIELD::SPEED, &velocity)) velocity = 0;
 
 		VERBOSE_FORMAT("getVelocity", "%d", velocity);
diff --git a/src/Gps.h b/src/Gps.h
index aac10d2..7fbd585 100644
--- a/src/Gps.h
+++ b/src/Gps.h
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <Arduino.h>
-#include <SIM808_Types.h>
+#include <SIM808.Types.h>
 
 #include "Hardware.h"
 #include "Time2.h"
diff --git a/src/Hardware.cpp b/src/Hardware.cpp
index 246cff2..99d360b 100644
--- a/src/Hardware.cpp
+++ b/src/Hardware.cpp
@@ -59,7 +59,7 @@ namespace hardware {
 				//SIM808 turns phone on by default but we don't need it for gps only
 				device.setPhoneFunctionality(SIM808_PHONE_FUNCTIONALITY::MINIMUM);
 			}
-			device.enableGps();
+			device.powerOnOffGps(true);
 		}
 
 		void gpsPowerOff() {
@@ -74,7 +74,7 @@ namespace hardware {
 			}
 
 			VERBOSE("gpsPowerOff");
-			device.disableGps();
+			device.powerOnOffGps(false);
 			powerOffIfUnused();
 		}
 
diff --git a/src/Network.cpp b/src/Network.cpp
index 0cab1c0..463d380 100644
--- a/src/Network.cpp
+++ b/src/Network.cpp
@@ -22,9 +22,9 @@ namespace network {
 	}
 
 	__attribute__((__optimize__("O2")))
-	SIM808RegistrationStatus waitForRegistered(uint32_t timeout, bool relativeToPowerOnTime = true) {
+	SIM808_NETWORK_REGISTRATION_STATE waitForRegistered(uint32_t timeout, bool relativeToPowerOnTime = true) {
 
-		SIM808RegistrationStatus currentStatus;
+		SIM808_NETWORK_REGISTRATION_STATE currentStatus;
 		SIM808SignalQualityReport report;
 		uint8_t noReliableNetwork = 0;
 
@@ -34,9 +34,9 @@ namespace network {
 		report = hardware::sim808::device.getSignalQuality();
 
 		do {
-			if (isAvailable(currentStatus.stat)) break;
+			if (isAvailable(currentStatus)) break;
 
-			NOTICE_FORMAT("waitForRegistered", "%d, [%d %ddBm]", currentStatus.stat, report.rssi, report.attenuation);
+			NOTICE_FORMAT("waitForRegistered", "%d, [%d %ddBm]", currentStatus, report.rssi, report.attenuation);
 
 			if (report.rssi < NETWORK_DEFAULT_NO_NETWORK_QUALITY_THRESHOLD) noReliableNetwork++;
 			else noReliableNetwork = 0;
@@ -52,7 +52,7 @@ namespace network {
 			report = hardware::sim808::device.getSignalQuality();
 		} while (timeout > 1);
 
-		NOTICE_FORMAT("waitForRegistered", "%d, [%d %ddBm]", currentStatus.stat, report.rssi, report.attenuation);
+		NOTICE_FORMAT("waitForRegistered", "%d, [%d %ddBm]", currentStatus, report.rssi, report.attenuation);
 		return currentStatus;
 	}
 
diff --git a/src/Network.h b/src/Network.h
index 555e20e..061c3c4 100644
--- a/src/Network.h
+++ b/src/Network.h
@@ -8,7 +8,7 @@ namespace network {
 	void powerOn();
 	void powerOff();
 
-	SIM808RegistrationStatus waitForRegistered(uint32_t timeout, bool relativeToPowerOnTime = true);
+	SIM808_NETWORK_REGISTRATION_STATE waitForRegistered(uint32_t timeout, bool relativeToPowerOnTime = true);
 	bool isAvailable(SIM808_NETWORK_REGISTRATION_STATE state);
 #if BACKUP_ENABLE_NETWORK
 	bool enableGprs();
diff --git a/src/NetworkPositionsBackup.cpp b/src/NetworkPositionsBackup.cpp
index 4b90370..183c9e2 100644
--- a/src/NetworkPositionsBackup.cpp
+++ b/src/NetworkPositionsBackup.cpp
@@ -57,7 +57,7 @@ namespace positions {
 			void NetworkPositionsBackup::appendPositions() {
 				uint16_t currentEntryIndex = config::main::value.network.lastSavedEntry + 1;
 				PositionEntry currentEntry;
-				SIM808RegistrationStatus networkStatus;
+				SIM808_NETWORK_REGISTRATION_STATE networkStatus;
 
 				//avoid edge case where if 0, whole set of positions will be sent again
 				if (!positions::count(config::main::value.network.lastSavedEntry)) return;
@@ -65,7 +65,7 @@ namespace positions {
 				network::powerOn();
 				networkStatus = network::waitForRegistered(NETWORK_DEFAULT_TOTAL_TIMEOUT_MS);
 
-				if (!network::isAvailable(networkStatus.stat) || !network::enableGprs()) {
+				if (!network::isAvailable(networkStatus) || !network::enableGprs()) {
 					networkUnavailableInARow = min(networkUnavailableInARow + 1, POSITIONS_CONFIG_NET_DEFAULT_UNAVAILABLE_NETWORK_POSTPONE_THRESHOLD + 1); //avoid increment overflow
 					NOTICE_MSG("appendPositions", "network or gprs unavailable");
 
diff --git a/src/Positions.h b/src/Positions.h
index bc552f5..268a9b5 100644
--- a/src/Positions.h
+++ b/src/Positions.h
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <Arduino.h>
-#include <SIM808_Types.h>
+#include <SIM808.Types.h>
 
 #define POSITION_SIZE 115
 
diff --git a/src/config/System.h b/src/config/System.h
index 331672c..c82e618 100644
--- a/src/config/System.h
+++ b/src/config/System.h
@@ -20,7 +20,7 @@
  \def VERSION
  Version string, only used for indicative purpose
  */
-#define VERSION "1.30"
+#define VERSION "1.40"
 
 
 /**