diff --git a/platformio.ini b/platformio.ini
index 766a9396..fc8bbdad 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -55,6 +55,7 @@ lib_deps_rtc =
 lib_deps_basic =
     ArduinoJson@^5.13.1
     Time@>=1.5
+    Timezone@^1.2.2
 lib_deps_all =
     ${common.lib_deps_basic}
     ${common.lib_deps_lora}
diff --git a/src/hal/ttgofox.h b/src/hal/ttgofox.h
index 414cedd1..daff6a38 100644
--- a/src/hal/ttgofox.h
+++ b/src/hal/ttgofox.h
@@ -27,6 +27,10 @@
 // Settings for IF482 interface
 //#define HAS_IF482 9600, SERIAL_7E1, GPIO_NUM_12, GPIO_NUM_14 // IF482 serial port parameters
 
+// Settings for external GPS chip
+//#define HAS_GPS 1 // use on board GPS
+//#define GPS_SERIAL 9600, SERIAL_8N1, GPIO_NUM_17, GPIO_NUM_16 // UBlox NEO 6M or 7M with default configuration
+
 // Pins for LORA chip SPI interface, reset line and interrupt lines
 #define LORA_SCK  (5) 
 #define LORA_CS   (18)