This update will also upgrade the software in your GXM30 antenna to version 2.20.
Changes made from version 3.00 to 3.10: Improvements to TAF & METAR reports for visibility and remarks.
System requirements:
IBM-compatible PC running Windows 2000 or Windows XP operating system and an available Com 1, 2, 3, or 4 port.
PC Interface Cable for your GPS unit. The PC Interface Cable may be purchased through your local Garmin distributor or ordered direct from Garmin Online Store