diff --git a/src/globals.h b/src/globals.h
index e9c2fb5b..711f0bd9 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -51,11 +51,11 @@ typedef struct {
 
 #ifdef HAS_GPS
   typedef struct {
-    double latitude;
-    double longitude;
-    double hdop;
-    uint32_t satellites;
-    double altitude;
+    float latitude;
+    float longitude;
+    float hdop;
+    uint8_t satellites;
+    uint16_t altitude;
     } gpsStatus_t;
   extern gpsStatus_t gps_status;        // struct for storing gps data
   extern TinyGPSPlus gps;               // Make TinyGPS++ instance globally availabe
diff --git a/src/gpsread.cpp b/src/gpsread.cpp
index 15b5ed50..6669b80b 100644
--- a/src/gpsread.cpp
+++ b/src/gpsread.cpp
@@ -7,11 +7,13 @@ static const char TAG[] = "main";
 
 // GPS read data to global struct
 void gps_read(){
-    gps_status.latitude = gps.location.lat();
-    gps_status.longitude = gps.location.lng();
-    gps_status.satellites = gps.satellites.value();
-    gps_status.hdop = gps.hdop.value();
-    gps_status.altitude = gps.altitude.meters(); 
+    gps_status.latitude = (float) gps.location.lat();
+    gps_status.longitude = (float) gps.location.lng();
+    gps_status.satellites = (uint8_t) gps.satellites.value();
+    gps_status.hdop = (float) gps.hdop.value();
+    gps_status.altitude = (uint16_t) gps.altitude.meters(); 
+    ESP_LOGI(TAG, "Lat: %f / Lon: %f", gps_status.latitude, gps_status.longitude);
+    ESP_LOGI(TAG, "Sats: %d / HDOP: %f / Alti: %d", gps_status.satellites, gps_status.hdop, gps_status.altitude);
 }
 
 /// GPS serial feed FreeRTos Task
diff --git a/src/hal/fipy.h b/src/hal/fipy.h
index 7622d811..9f88928d 100644
--- a/src/hal/fipy.h
+++ b/src/hal/fipy.h
@@ -2,18 +2,18 @@
 
 #define CFG_sx1272_radio 1
 #define HAS_LED NOT_A_PIN // FiPy has no on board LED, so we use RGB LED
-#define HAS_RGB_LED   0  // WS2812B RGB LED on GPIO0
+#define HAS_RGB_LED   GPIO_NUM_0  // WS2812B RGB LED on GPIO0
 
 // Hardware pin definitions for Pycom FiPy board
-#define PIN_SPI_SS    18
-#define PIN_SPI_MOSI  27
-#define PIN_SPI_MISO  19
-#define PIN_SPI_SCK   5
+#define PIN_SPI_SS    GPIO_NUM_18
+#define PIN_SPI_MOSI  GPIO_NUM_27
+#define PIN_SPI_MISO  GPIO_NUM_19
+#define PIN_SPI_SCK   GPIO_NUM_5
 #define RST   LMIC_UNUSED_PIN
-#define DIO0  23 // LoRa IRQ
-#define DIO1  23 // workaround
+#define DIO0  GPIO_NUM_23 // LoRa IRQ
+#define DIO1  GPIO_NUM_23 // workaround
 #define DIO2  LMIC_UNUSED_PIN
 
 // select WIFI antenna (internal = onboard / external = u.fl socket)
-#define HAS_ANTENNA_SWITCH  21      // pin for switching wifi antenna
-#define WIFI_ANTENNA 0              // 0 = internal, 1 = external
+#define HAS_ANTENNA_SWITCH  GPIO_NUM_21 // pin for switching wifi antenna
+#define WIFI_ANTENNA 0  // 0 = internal, 1 = external
diff --git a/src/hal/heltec.h b/src/hal/heltec.h
index ed2e63db..74bdb89a 100644
--- a/src/hal/heltec.h
+++ b/src/hal/heltec.h
@@ -8,18 +8,18 @@
 #define HAS_BUTTON GPIO_NUM_0 // button "PROG" on board
 
 // re-define pin definitions of pins_arduino.h
-#define PIN_SPI_SS    18 // ESP32 GPIO18 (Pin18) -- SX1276 NSS (Pin19) SPI Chip Select Input
-#define PIN_SPI_MOSI  27 // ESP32 GPIO27 (Pin27) -- SX1276 MOSI (Pin18) SPI Data Input
-#define PIN_SPI_MISO  19 // ESP32 GPIO19 (Pin19) -- SX1276 MISO (Pin17) SPI Data Output
-#define PIN_SPI_SCK   5  // ESP32 GPIO5 (Pin5)   -- SX1276 SCK (Pin16) SPI Clock Input
+#define PIN_SPI_SS    GPIO_NUM_18 // ESP32 GPIO18 (Pin18) -- SX1276 NSS (Pin19) SPI Chip Select Input
+#define PIN_SPI_MOSI  GPIO_NUM_27 // ESP32 GPIO27 (Pin27) -- SX1276 MOSI (Pin18) SPI Data Input
+#define PIN_SPI_MISO  GPIO_NUM_19 // ESP32 GPIO19 (Pin19) -- SX1276 MISO (Pin17) SPI Data Output
+#define PIN_SPI_SCK   GPIO_NUM_5  // ESP32 GPIO5 (Pin5)   -- SX1276 SCK (Pin16) SPI Clock Input
 
 // non arduino pin definitions
-#define RST   14 // ESP32 GPIO14 (Pin14) -- SX1276 NRESET (Pin7) Reset Trigger Input
-#define DIO0  26 // ESP32 GPIO26 (Pin15) -- SX1276 DIO0 (Pin8) used by LMIC for detecting LoRa RX_Done & TX_Done
-#define DIO1  33 // ESP32 GPIO33 (Pin13) -- SX1276 DIO1 (Pin9) used by LMIC for detecting LoRa RX_Timeout
+#define RST   GPIO_NUM_14 // ESP32 GPIO14 (Pin14) -- SX1276 NRESET (Pin7) Reset Trigger Input
+#define DIO0  GPIO_NUM_26 // ESP32 GPIO26 (Pin15) -- SX1276 DIO0 (Pin8) used by LMIC for detecting LoRa RX_Done & TX_Done
+#define DIO1  GPIO_NUM_33 // ESP32 GPIO33 (Pin13) -- SX1276 DIO1 (Pin9) used by LMIC for detecting LoRa RX_Timeout
 #define DIO2  LMIC_UNUSED_PIN // 32 ESP32 GPIO32 (Pin12) -- SX1276 DIO2 (Pin10) not used by LMIC for LoRa (Timeout for FSK only)
 
 // Hardware pin definitions for Heltec LoRa-32 Board with OLED SSD1306 I2C Display
-#define OLED_RST 16 // ESP32 GPIO16 (Pin16) -- SD1306 RST
-#define OLED_SDA 4  // ESP32 GPIO4 (Pin4)   -- SD1306 D1+D2
-#define OLED_SCL 15 // ESP32 GPIO15 (Pin15) -- SD1306 D0
+#define OLED_RST GPIO_NUM_16 // ESP32 GPIO16 (Pin16) -- SD1306 RST
+#define OLED_SDA GPIO_NUM_4  // ESP32 GPIO4 (Pin4)   -- SD1306 D1+D2
+#define OLED_SCL GPIO_NUM_15 // ESP32 GPIO15 (Pin15) -- SD1306 D0
diff --git a/src/hal/lopy.h b/src/hal/lopy.h
index 219a3a96..137c8e53 100644
--- a/src/hal/lopy.h
+++ b/src/hal/lopy.h
@@ -2,16 +2,16 @@
 
 #define CFG_sx1272_radio 1
 #define HAS_LED NOT_A_PIN // LoPy4 has no on board LED, so we use RGB LED on LoPy4
-#define HAS_RGB_LED   0  // WS2812B RGB LED on GPIO0
+#define HAS_RGB_LED GPIO_NUM_0  // WS2812B RGB LED on GPIO0
 
 // Hardware pin definitions for Pycom LoPy board
-#define PIN_SPI_SS    17
-#define PIN_SPI_MOSI  27
-#define PIN_SPI_MISO  19
-#define PIN_SPI_SCK   5
-#define RST   18
-#define DIO0  23 // LoRa IRQ
-#define DIO1  23 // workaround
+#define PIN_SPI_SS    GPIO_NUM_17
+#define PIN_SPI_MOSI  GPIO_NUM_27
+#define PIN_SPI_MISO  GPIO_NUM_19
+#define PIN_SPI_SCK   GPIO_NUM_5
+#define RST   GPIO_NUM_18
+#define DIO0  GPIO_NUM_23 // LoRa IRQ
+#define DIO1  GPIO_NUM_23 // workaround
 #define DIO2  LMIC_UNUSED_PIN
 
 // select WIFI antenna (internal = onboard / external = u.fl socket)
diff --git a/src/hal/lopy4.h b/src/hal/lopy4.h
index aaed263a..586f1bb2 100644
--- a/src/hal/lopy4.h
+++ b/src/hal/lopy4.h
@@ -2,16 +2,16 @@
 
 #define CFG_sx1276_radio 1
 #define HAS_LED NOT_A_PIN // LoPy4 has no on board LED, so we use RGB LED on LoPy4
-#define HAS_RGB_LED   0  // WS2812B RGB LED on GPIO0
+#define HAS_RGB_LED   GPIO_NUM_0  // WS2812B RGB LED on GPIO0
 
 // Hardware pin definitions for Pycom LoPy4 board
-#define PIN_SPI_SS    18
-#define PIN_SPI_MOSI  27
-#define PIN_SPI_MISO  19
-#define PIN_SPI_SCK   5
+#define PIN_SPI_SS    GPIO_NUM_18
+#define PIN_SPI_MOSI  GPIO_NUM_27
+#define PIN_SPI_MISO  GPIO_NUM_19
+#define PIN_SPI_SCK   GPIO_NUM_5
 #define RST   LMIC_UNUSED_PIN
-#define DIO0  23 // LoRa IRQ
-#define DIO1  23 // workaround
+#define DIO0  GPIO_NUM_23 // LoRa IRQ
+#define DIO1  GPIO_NUM_23 // workaround
 #define DIO2  LMIC_UNUSED_PIN
 
 // select WIFI antenna (internal = onboard / external = u.fl socket)
diff --git a/src/hal/ttgobeam.h b/src/hal/ttgobeam.h
index 9a05de26..fb5dae8b 100644
--- a/src/hal/ttgobeam.h
+++ b/src/hal/ttgobeam.h
@@ -6,7 +6,7 @@
 //#define HAS_BUTTON GPIO_NUM_39 // on board button "BOOT" (next to reset button) !! seems not to work!!
 #define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
 #define BATT_FACTOR 2 // voltage divider 100k/100k on board
-#define HAS_GPS 9600, SERIAL_8N1, 12, 15
+#define HAS_GPS 9600, SERIAL_8N1, GPIO_NUM_12, GPIO_NUM_15 // UBlox NEO 6M or 7M 
 
 // re-define pin definitions of pins_arduino.h
 #define PIN_SPI_SS    GPIO_NUM_18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
diff --git a/src/hal/ttgov1.h b/src/hal/ttgov1.h
index c8e1a12d..df5735b5 100644
--- a/src/hal/ttgov1.h
+++ b/src/hal/ttgov1.h
@@ -9,18 +9,18 @@
 #define HAS_BUTTON GPIO_NUM_0 // button "PRG" on board
 
 // re-define pin definitions of pins_arduino.h
-#define PIN_SPI_SS    18 // ESP32 GPIO18 (Pin18) -- SX1276 NSS (Pin19) SPI Chip Select Input
-#define PIN_SPI_MOSI  27 // ESP32 GPIO27 (Pin27) -- SX1276 MOSI (Pin18) SPI Data Input
-#define PIN_SPI_MISO  19 // ESP32 GPIO19 (Pin19) -- SX1276 MISO (Pin17) SPI Data Output
-#define PIN_SPI_SCK   5  // ESP32 GPIO5 (Pin5)   -- SX1276 SCK (Pin16) SPI Clock Input
+#define PIN_SPI_SS    GPIO_NUM_18 // ESP32 GPIO18 (Pin18) -- SX1276 NSS (Pin19) SPI Chip Select Input
+#define PIN_SPI_MOSI  GPIO_NUM_27 // ESP32 GPIO27 (Pin27) -- SX1276 MOSI (Pin18) SPI Data Input
+#define PIN_SPI_MISO  GPIO_NUM_19 // ESP32 GPIO19 (Pin19) -- SX1276 MISO (Pin17) SPI Data Output
+#define PIN_SPI_SCK   GPIO_NUM_5  // ESP32 GPIO5 (Pin5)   -- SX1276 SCK (Pin16) SPI Clock Input
 
 // non arduino pin definitions
-#define RST   14 // ESP32 GPIO14 (Pin14) -- SX1276 NRESET (Pin7) Reset Trigger Input
-#define DIO0  26 // ESP32 GPIO26 (Pin15) -- SX1276 DIO0 (Pin8) used by LMIC for detecting LoRa RX_Done & TX_Done
-#define DIO1  33 // ESP32 GPIO33 (Pin13) -- SX1276 DIO1 (Pin9) used by LMIC for detecting LoRa RX_Timeout
+#define RST   GPIO_NUM_14 // ESP32 GPIO14 (Pin14) -- SX1276 NRESET (Pin7) Reset Trigger Input
+#define DIO0  GPIO_NUM_26 // ESP32 GPIO26 (Pin15) -- SX1276 DIO0 (Pin8) used by LMIC for detecting LoRa RX_Done & TX_Done
+#define DIO1  GPIO_NUM_33 // ESP32 GPIO33 (Pin13) -- SX1276 DIO1 (Pin9) used by LMIC for detecting LoRa RX_Timeout
 #define DIO2  LMIC_UNUSED_PIN // 32 ESP32 GPIO32 (Pin12) -- SX1276 DIO2 (Pin10) not used by LMIC for LoRa (Timeout for FSK only)
 
 // Hardware pin definitions for TTGOv1 Board with OLED SSD1306 I2C Display
-#define OLED_RST 16 // ESP32 GPIO16 (Pin16) -- SD1306 Reset
-#define OLED_SDA 4  // ESP32 GPIO4 (Pin4)   -- SD1306 Data
-#define OLED_SCL 15 // ESP32 GPIO15 (Pin15) -- SD1306 Clock
+#define OLED_RST GPIO_NUM_16 // ESP32 GPIO16 (Pin16) -- SD1306 Reset
+#define OLED_SDA GPIO_NUM_4  // ESP32 GPIO4 (Pin4)   -- SD1306 Data
+#define OLED_SCL GPIO_NUM_15 // ESP32 GPIO15 (Pin15) -- SD1306 Clock
diff --git a/src/hal/ttgov2.h b/src/hal/ttgov2.h
index ebdfe87d..e4bb49b4 100644
--- a/src/hal/ttgov2.h
+++ b/src/hal/ttgov2.h
@@ -10,21 +10,21 @@
 #define DISABLE_BROWNOUT 1 // comment out if you want to keep brownout feature
 
 // re-define pin definitions of pins_arduino.h
-#define PIN_SPI_SS    18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
-#define PIN_SPI_MOSI  27 // ESP32 GPIO27 (Pin27) -- HPD13A MOSI/DSI (Pin6) SPI Data Input
-#define PIN_SPI_MISO  19 // ESP32 GPIO19 (Pin19) -- HPD13A MISO/DSO (Pin7) SPI Data Output
-#define PIN_SPI_SCK   5  // ESP32 GPIO5 (Pin5)   -- HPD13A SCK (Pin5) SPI Clock Input
+#define PIN_SPI_SS    GPIO_NUM_18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
+#define PIN_SPI_MOSI  GPIO_NUM_27 // ESP32 GPIO27 (Pin27) -- HPD13A MOSI/DSI (Pin6) SPI Data Input
+#define PIN_SPI_MISO  GPIO_NUM_19 // ESP32 GPIO19 (Pin19) -- HPD13A MISO/DSO (Pin7) SPI Data Output
+#define PIN_SPI_SCK   GPIO_NUM_5  // ESP32 GPIO5 (Pin5)   -- HPD13A SCK (Pin5) SPI Clock Input
 
 // non arduino pin definitions
 #define RST   LMIC_UNUSED_PIN // connected to ESP32 RST/EN
-#define DIO0  26 // ESP32 GPIO26 wired on PCB to HPD13A
-#define DIO1  33 // HPDIO1 on pcb, needs to be wired external to GPIO33
+#define DIO0  GPIO_NUM_26 // ESP32 GPIO26 wired on PCB to HPD13A
+#define DIO1  GPIO_NUM_33 // HPDIO1 on pcb, needs to be wired external to GPIO33
 #define DIO2  LMIC_UNUSED_PIN // 32 HPDIO2 on pcb, needs to be wired external to GPIO32 (not necessary for LoRa, only FSK)
 
 // Hardware pin definitions for TTGO V2 Board with OLED SSD1306 0,96" I2C Display
 #define OLED_RST U8X8_PIN_NONE // connected to CPU RST/EN
-#define OLED_SDA 21  // ESP32 GPIO4 (Pin4)   -- SD1306 D1+D2
-#define OLED_SCL 22 // ESP32 GPIO15 (Pin15) -- SD1306 D0
+#define OLED_SDA GPIO_NUM_21  // ESP32 GPIO4 (Pin4)   -- SD1306 D1+D2
+#define OLED_SCL GPIO_NUM_22 // ESP32 GPIO15 (Pin15) -- SD1306 D0
 
 
 /*
diff --git a/src/hal/ttgov21.h b/src/hal/ttgov21.h
index ebedf11b..1e3b38ec 100644
--- a/src/hal/ttgov21.h
+++ b/src/hal/ttgov21.h
@@ -4,23 +4,23 @@
 
 #define HAS_DISPLAY U8X8_SSD1306_128X64_NONAME_HW_I2C
 #define DISPLAY_FLIP  1 // rotated display
-#define HAS_LED 23 // green on board LED_G3 (not in initial board version)
+#define HAS_LED GPIO_NUM_23 // green on board LED_G3 (not in initial board version)
 #define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7
 #define BATT_FACTOR 2 // voltage divider 100k/100k on board
 
 // re-define pin definitions of pins_arduino.h
-#define PIN_SPI_SS    18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
-#define PIN_SPI_MOSI  27 // ESP32 GPIO27 (Pin27) -- HPD13A MOSI/DSI (Pin6) SPI Data Input
-#define PIN_SPI_MISO  19 // ESP32 GPIO19 (Pin19) -- HPD13A MISO/DSO (Pin7) SPI Data Output
-#define PIN_SPI_SCK   5  // ESP32 GPIO5 (Pin5)   -- HPD13A SCK (Pin5) SPI Clock Input
+#define PIN_SPI_SS    GPIO_NUM_18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
+#define PIN_SPI_MOSI  GPIO_NUM_27 // ESP32 GPIO27 (Pin27) -- HPD13A MOSI/DSI (Pin6) SPI Data Input
+#define PIN_SPI_MISO  GPIO_NUM_19 // ESP32 GPIO19 (Pin19) -- HPD13A MISO/DSO (Pin7) SPI Data Output
+#define PIN_SPI_SCK   GPIO_NUM_5  // ESP32 GPIO5 (Pin5)   -- HPD13A SCK (Pin5) SPI Clock Input
 
 // non arduino pin definitions
 #define RST   LMIC_UNUSED_PIN // connected to ESP32 RST/EN
-#define DIO0  26 // ESP32 GPIO26 <-> HPD13A IO0
-#define DIO1  33 // ESP32 GPIO33 <-> HPDIO1 <-> HPD13A IO1
-#define DIO2  32 // ESP32 GPIO32 <-> HPDIO2 <-> HPD13A IO2
+#define DIO0  GPIO_NUM_26 // ESP32 GPIO26 <-> HPD13A IO0
+#define DIO1  GPIO_NUM_33 // ESP32 GPIO33 <-> HPDIO1 <-> HPD13A IO1
+#define DIO2  GPIO_NUM_32 // ESP32 GPIO32 <-> HPDIO2 <-> HPD13A IO2
 
 // Hardware pin definitions for TTGO V2 Board with OLED SSD1306 0,96" I2C Display
 #define OLED_RST U8X8_PIN_NONE // connected to CPU RST/EN
-#define OLED_SDA 21 // ESP32 GPIO4 (Pin4)   -- SD1306 D1+D2
-#define OLED_SCL 22 // ESP32 GPIO15 (Pin15) -- SD1306 D0
\ No newline at end of file
+#define OLED_SDA GPIO_NUM_21 // ESP32 GPIO4 (Pin4)   -- SD1306 D1+D2
+#define OLED_SCL GPIO_NUM_22 // ESP32 GPIO15 (Pin15) -- SD1306 D0
\ No newline at end of file
diff --git a/src/rcommand.cpp b/src/rcommand.cpp
index e01860fb..926795a5 100644
--- a/src/rcommand.cpp
+++ b/src/rcommand.cpp
@@ -260,12 +260,13 @@ void get_voltage (uint8_t val) {
 void get_gps (uint8_t val) {
     ESP_LOGI(TAG, "Remote command: get gps status");
     #ifdef HAS_GPS
-    if (gps.location.isValid()) {
         gps_read();
         transmit((byte*)&gps_status, sizeof(gps_status));
         ESP_LOGI(TAG, "HDOP=%d, SATS=%d, LAT=%d, LON=%d", gps_status.hdop, gps_status.satellites, gps_status.latitude, gps_status.longitude );
-    }
+    #else
+        ESP_LOGE(TAG, "No GPS device present");
     #endif
+
 };