Enables you to select what items you want included in the calendar and then provides a subscribe link (if your device supports direct subscribing to iCal calendars) and also a link that can be copied and used if direct subscription is not supported (for example on Android phones)
Be sure to copy the full address as it is specific to your iCal selection and without the full address it will not work at all. You can also generate different links if you want different versions of the calendar on different devices, for example all member's bookings, your and aircraft warnings and diary notes for a calendar on your PC but only your bookings and warnings for a calendar on your smartphone.
To get the calendar on an Android phone you need to generate a link and copy it. Then go to your Google calendar on a PC and Add a calendar (selecting Add from URL) then paste the generated link.