Distance between two GPS points not working

[pctb2007 (Paulo Borges)]

Hi, I need to measure the distance between two locations (GPS coordinates)
I found the the following math here: math - Calculate distance between 2 GPS coordinates - Stack Overflow

function degreesToRadians(degrees) {
  return degrees * Math.PI / 180;
}

function distanceInKmBetweenEarthCoordinates(lat1, lon1, lat2, lon2) {
  var earthRadiusKm = 6371;

  var dLat = degreesToRadians(lat2-lat1);
  var dLon = degreesToRadians(lon2-lon1);

  lat1 = degreesToRadians(lat1);
  lat2 = degreesToRadians(lat2);

  var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
          Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  return earthRadiusKm * c;
}

And I “imported” the idea to Kodular as follow:

But when I run, the distance does not match.
I tested the suggested values for lat/long,lat1/long1 and also other coordinates but no good.
I checked the math a number of times and cannot find where I did wrong.

I did create a variable “b” just to make the blocks more readable but it does not change the result.

Help welcome
Thanks in advance
Paulo

[Peter (Moderator)]

I like that you are trying to build the procedure. @vknow360 also made a extension to calculate this.

DistanceCalc : Calculate distance between two places from coordinates

Well… I am here to present my first extension (ever) to this community. As you have read in title DistanceCalc calculates distance (sometimes accurate) between two places from coordinates (latitudes and longitudes). Blocks Just a single block… [12-19_17_29] Usage It has just one function/block as you can see in above screenshot. [12-19_18_00] It accepts four coordinates in format like lat1,lng1,lat2, and lng2 and all of them should be integers(double).It returns distance in KiloMetres. …

[pctb2007 (Paulo Borges)]

Dear Peter, just tested, works 100%.
Thanks
Paulo.