Showing GPS coordinates on map using sim808 module

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this is the code i used with my arduino to create a map and it shows data properly on the map.

float x = 0.5;
float y = 0.4;
float z = 0.2;
  char buffer1[50];
  buffer[0] = '[';
  size_t offset = 1;
  dtostrf(x, 1, 3, &buffer[offset]);
  offset += strlen(&buffer[offset]);
  buffer[offset++] = ',';
  dtostrf(y, 1, 3, &buffer[offset]);
  offset += strlen(&buffer[offset]);
  buffer[offset++] = ',';
  dtostrf(z, 1, 3, &buffer[offset]);
  offset += strlen(&buffer[offset]);
  buffer[offset++] = ']';
  buffer[offset] = 0;
Serial.println(buffer);

Cayenne.virtualWrite(20, buffer, "gps", "m");