diff --git a/GPSSpeedMultiCore.ino b/GPSSpeedMultiCore.ino
index b5238f8..e166dab 100644
--- a/GPSSpeedMultiCore.ino
+++ b/GPSSpeedMultiCore.ino
@@ -65,7 +65,7 @@ bool setStartBrightness() {
   double az, el;
   setTime(myGPS.getHour(),myGPS.getMinute(),myGPS.getSecond(),myGPS.getDay(),myGPS.getMonth(),myGPS.getYear());
   time_t timeUtc=now();
-  calcHorizontalCoordinates(timeUtc,myGPS.getLatitude(),myGPS.getLongitude(),az,el);
+  calcHorizontalCoordinates(timeUtc,(double) myGPS.getLatitude()*10000000,(double) myGPS.getLongitude() * 10000000,az,el);
 
   if(el>SUNRISESET_STD_ALTITUDE){
     screenBrightnessCurrent=15;