diff --git a/sfy-buoy/sfy-ext-gps/ext-gps-mod/demo_gps.cpp b/sfy-buoy/sfy-ext-gps/ext-gps-mod/demo_gps.cpp
index cf4ee06d..1bd42255 100644
--- a/sfy-buoy/sfy-ext-gps/ext-gps-mod/demo_gps.cpp
+++ b/sfy-buoy/sfy-ext-gps/ext-gps-mod/demo_gps.cpp
@@ -50,7 +50,7 @@ void setup_gps() {
   if (ok) ok = gnss.setI2CInput(COM_TYPE_UBX);
   if (ok) ok = gnss.setUART1Output(0);
   if (ok) ok = gnss.setUART1Input(0);
-  if (ok) ok = gnss.setNavigationFrequency(1); //Set output in Hz.
+  if (ok) ok = gnss.setNavigationFrequency(20); //Set output in Hz.
 
   Serial.print(F("GPS setup flag: "));
   Serial.println(ok);
@@ -61,8 +61,12 @@ void setup_gps() {
 
 void loop_gps() {
   // TODO: move these to PPS?
-  gnss.checkUblox();
-  gnss.checkCallbacks();
+  /* gnss.checkUblox(); */
+  /* gnss.checkCallbacks(); */
+  /* if (gnss.newdata()) { */
+  /*   data = gnss.getdata(); */
+  /*   getPVT(data); */
+  /* } */
 }
 
 
@@ -71,8 +75,9 @@ void pps() {
   pps_ts = micros();
 
   Serial.println("GNSS: PPS!");
+  gnss.checkUblox();
+  gnss.checkCallbacks();
 
-  // TODO: checkUblox + checkCallbacks
 }
 
 # endif
diff --git a/sfy-buoy/sfy-ext-gps/ext-gps-mod/ext-gps-mod.ino b/sfy-buoy/sfy-ext-gps/ext-gps-mod/ext-gps-mod.ino
index 6d9acdc8..14acd197 100644
--- a/sfy-buoy/sfy-ext-gps/ext-gps-mod/ext-gps-mod.ino
+++ b/sfy-buoy/sfy-ext-gps/ext-gps-mod/ext-gps-mod.ino
@@ -4,7 +4,10 @@
 // Serial to SFY
 // TX1: ~7 / 42
 // RX1: ~8 / 38
-Uart sfy{1, 38, 42};
+// ..
+// TX1: ~9 / 39
+// RX1: ~10 / 40
+Uart sfy{1, 40, 39};
 
 void setup()
 {
@@ -27,9 +30,17 @@ void setup()
 
 void loop()
 {
+  static int i = 0;
+
   loop_gps();
   Serial.print(".");
-  delay(50);
+  delay(100);
+
+  JsonDocument doc;
+  doc["loop"] = i;
+  serializeJson(doc, sfy);
+
+  i++;
 }
 
 void main_pps() {