When downloaded, GLM 4 offers the Cloud version of AutoCal since this enables the user to draw on a huge pool of calibration data built up over many years, as well as offering secure access to the latest software updates and our Genelec helpdesk. For those GLM installations that are never routinely connected to the Internet, once GLM is downloaded and installed, the local AutoCal can be downloaded as a separate software install, to allow calibrations even when the computer has no internet access.