Free download of both location databases and airspaces for Macintosh - world wide:

Attention, SHL no longer updates the data offered here every month!

In the list you will find a disk image (*.dmg) for each region.
Each image conains three files:

• The krd file defines airports, nav aids and compulsory reporting points (if defined)
• The spa file defines general data of airspaces like name, class or height.
• The seg file defines the horizontal size (via line and arc segments)

• call PreFlight and select the "Locations - Update" menu,
• open the downloaded folder and
• click the "Update" button.