A. All current GARMIN handheld aviation units' databases are updated via your PC. We distribute our Jeppesen database updates on 3.5" floppy diskettes. These diskettes also contain the transfer software which will enable you to download the database from the diskette into your GPS unit from an IBM-compatible PC. In addition to the update diskettes, you will also need a PC Interface cable to connect the GPS unit to the serial port of your PC.