Went to the Lowrance web site, for no particular reason, and found this.
"Lowrance Avionics®, working with the FAA to enhance situational awareness during taxi operations, has announced free downloads of new enhanced "Safe Flight 21" maps for use with AirMap® 500, 1000 and 2000c products. Over 80 of these high detail taxiway diagram maps are now available for the nation's largest and busiest airports with additional airports being added (view map of currently available airports)."
http://www.lowrance.com/aviation/taxi/taxi.asp
"Lowrance Avionics®, working with the FAA to enhance situational awareness during taxi operations, has announced free downloads of new enhanced "Safe Flight 21" maps for use with AirMap® 500, 1000 and 2000c products. Over 80 of these high detail taxiway diagram maps are now available for the nation's largest and busiest airports with additional airports being added (view map of currently available airports)."
http://www.lowrance.com/aviation/taxi/taxi.asp