Two GPS questions

1. Using the Garmin GPS 500, you can obtain time enroute to the next waypoint but is there a way to (easily) obtain remaining time enroute to the destination airport? 2. Looking in the Learning Center, I could not locate any information re: which colors represent the different types of airspace depicted in the GPS. I believe that dark blue represents Class B but what about the other colors?Thanks for any info.Bob