EXIF is a binary format. I would expect it to just stuff a double in there. So 16 digits is what you get even if you need less. 32 bit floats aren't precise eno

EXIF is a binary format. I would expect it to just stuff a double in there. So 16 digits is what you get even if you need less. 32 bit floats aren't precise enough to store latitude/longitude coordinates.