use Geo::ECEF to convert ECEF x,y,z to lat,lon,height. result seems to not be perfect, we get:
lat=43.7248849001017, lon=15.7995159586422, HAE=54.9794641761109
gpsd(8) prints just lat=43.72 lon=15.80 alt=13.29
but SLC debug gives: 43.724897,15.799583,55.54